Stop requiring a fabric index to be provided when writing fabric-scoped structs with chip-tool.

[bzbarsky-apple]

It's ignored on the server anyway, so no need to require people to send it.

Problem

Consumers have to write things like:

chip-tool accesscontrol write acl '[{"fabricIndex": 0, "privilege": 5, "authMode": 2, "subjects": [112233], "targets": null}]'

and then the fabric index gets ignored.

Change overview

Allow writing:

chip-tool accesscontrol write acl '[{"privilege": 5, "authMode": 2, "subjects": [112233], "targets": null}]'

and having it work.

Testing

Checked that parsing the new syntax does not fail. Examined the generated code to make sure it's sane.

[mlepage-google]

O frabjous day, calloo, callay!

[github-actions]

PR #17145: Size comparison from e434e64 to 5f7212b

Decreases (2 builds for linux)

platform	target	config	section	e434e64	5f7212b	change	% change
linux	chip-tool	debug	(read only)	10675509	10674597	-912	-0.0
			.rodata	537845	537589	-256	-0.0
			.text	9308869	9308213	-656	-0.0
	chip-tool-no-interactive-ipv6only	arm64	(read only)	10278076	10277500	-576	-0.0
			.rodata	512364	512204	-160	-0.0
			.text	8662932	8662516	-416	-0.0

Full report (28 builds for cc13x2_26x2, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)

platform	target	config	section	e434e64	5f7212b	change	% change
cc13x2_26x2	lock-ftd	LP_CC2652R7	(read only)	674371	674371	0	0.0
			(read/write)	177140	177140	0	0.0
			.bss	81552	81552	0	0.0
			.data	3168	3168	0	0.0
			.rodata	80555	80555	0	0.0
			.text	593336	593336	0	0.0
	lock-mtd	LP_CC2652R7	(read only)	623515	623515	0	0.0
			(read/write)	154304	154304	0	0.0
			.bss	77280	77280	0	0.0
			.data	3168	3168	0	0.0
			.rodata	80443	80443	0	0.0
			.text	542584	542584	0	0.0
	pump-app	LP_CC2652R7	(read only)	691687	691687	0	0.0
			(read/write)	160984	160984	0	0.0
			.bss	81944	81944	0	0.0
			.data	3200	3200	0	0.0
			.rodata	82487	82487	0	0.0
			.text	608716	608716	0	0.0
	pump-controller-app	LP_CC2652R7	(read only)	676059	676059	0	0.0
			(read/write)	176356	176356	0	0.0
			.bss	81688	81688	0	0.0
			.data	3164	3164	0	0.0
			.rodata	78987	78987	0	0.0
			.text	596588	596588	0	0.0
efr32	lighting-app	BRD4161A	(read only)	904604	904604	0	0.0
			(read/write)	133144	133144	0	0.0
			.bss	131152	131152	0	0.0
			.data	1992	1992	0	0.0
			.text	904596	904596	0	0.0
		BRD4161A+rpc	(read only)	932492	932492	0	0.0
			(read/write)	149092	149092	0	0.0
			.bss	146920	146920	0	0.0
			.data	2172	2172	0	0.0
			.text	932484	932484	0	0.0
	window-app	BRD4161A	(read only)	841964	841964	0	0.0
			(read/write)	131204	131204	0	0.0
			.bss	129328	129328	0	0.0
			.data	1876	1876	0	0.0
			.text	841956	841956	0	0.0
esp32	all-clusters-app	c3devkit	(read only)	991800	991800	0	0.0
			(read/write)	1461506	1461506	0	0.0
			.dram0.bss	63000	63000	0	0.0
			.dram0.data	14260	14260	0	0.0
			.flash.rodata	198760	198760	0	0.0
			.flash.text	991800	991800	0	0.0
			.iram0.text	62572	62572	0	0.0
		m5stack	(read only)	1044439	1044439	0	0.0
			(read/write)	462560	462560	0	0.0
			.dram0.bss	68528	68528	0	0.0
			.dram0.data	34064	34064	0	0.0
			.flash.rodata	227824	227824	0	0.0
			.flash.text	1039055	1039055	0	0.0
			.iram0.text	123415	123415	0	0.0
k32w	light	k32w061+release	(read/write)	684940	684940	0	0.0
			.bss	78240	78240	0	0.0
			.data	1988	1988	0	0.0
			.text	598912	598912	0	0.0
	lock	k32w061+release	(read/write)	689780	689780	0	0.0
			.bss	78816	78816	0	0.0
			.data	1948	1948	0	0.0
			.text	603216	603216	0	0.0
linux	all-clusters-app	debug	(read only)	2617801	2617801	0	0.0
			(read/write)	145384	145384	0	0.0
			.bss	57856	57856	0	0.0
			.data	1408	1408	0	0.0
			.data.rel.ro	80232	80232	0	0.0
			.dynamic	592	592	0	0.0
			.got	4312	4312	0	0.0
			.init	27	27	0	0.0
			.init_array	960	960	0	0.0
			.rodata	222117	222117	0	0.0
			.text	2226994	2226994	0	0.0
	bridge-app	debug+rpc	(read only)	1826685	1826685	0	0.0
			(read/write)	90824	90824	0	0.0
			.bss	44792	44792	0	0.0
			.data	2048	2048	0	0.0
			.data.rel.ro	38904	38904	0	0.0
			.dynamic	592	592	0	0.0
			.got	3928	3928	0	0.0
			.init	27	27	0	0.0
			.init_array	552	552	0	0.0
			.rodata	148249	148249	0	0.0
			.text	1561157	1561157	0	0.0
	chip-tool	debug	(read only)	10675509	10674597	-912	-0.0
			(read/write)	371640	371640	0	0.0
			.bss	22784	22784	0	0.0
			.data	1040	1040	0	0.0
			.data.rel.ro	341584	341584	0	0.0
			.dynamic	624	624	0	0.0
			.got	4928	4928	0	0.0
			.init	27	27	0	0.0
			.init_array	656	656	0	0.0
			.rodata	537845	537589	-256	-0.0
			.text	9308869	9308213	-656	-0.0
	chip-tool-no-interactive-ipv6only	arm64	(read only)	10278076	10277500	-576	-0.0
			(read/write)	492033	492033	0	0.0
			.bss	41041	41041	0	0.0
			.data	1120	1120	0	0.0
			.data.rel.ro	388704	388704	0	0.0
			.dynamic	560	560	0	0.0
			.got	57360	57360	0	0.0
			.init	24	24	0	0.0
			.init_array	184	184	0	0.0
			.rodata	512364	512204	-160	-0.0
			.text	8662932	8662516	-416	-0.0
	door-lock-app	debug	(read only)	2097897	2097897	0	0.0
			(read/write)	118864	118864	0	0.0
			.bss	48128	48128	0	0.0
			.data	1152	1152	0	0.0
			.data.rel.ro	64024	64024	0	0.0
			.dynamic	592	592	0	0.0
			.got	4256	4256	0	0.0
			.init	27	27	0	0.0
			.init_array	680	680	0	0.0
			.rodata	186281	186281	0	0.0
			.text	1757154	1757154	0	0.0
	lighting-app	debug+rpc	(read only)	2277817	2277817	0	0.0
			(read/write)	125920	125920	0	0.0
			.bss	49472	49472	0	0.0
			.data	1600	1600	0	0.0
			.data.rel.ro	69160	69160	0	0.0
			.dynamic	608	608	0	0.0
			.got	4304	4304	0	0.0
			.init	27	27	0	0.0
			.init_array	760	760	0	0.0
			.rodata	180489	180489	0	0.0
			.text	1933378	1933378	0	0.0
	ota-provider-app	debug	(read only)	2036033	2036033	0	0.0
			(read/write)	114432	114432	0	0.0
			.bss	47968	47968	0	0.0
			.data	1384	1384	0	0.0
			.data.rel.ro	59352	59352	0	0.0
			.dynamic	608	608	0	0.0
			.got	4456	4456	0	0.0
			.init	27	27	0	0.0
			.init_array	632	632	0	0.0
			.rodata	172291	172291	0	0.0
			.text	1708370	1708370	0	0.0
	ota-requestor-app	debug	(read only)	2065313	2065313	0	0.0
			(read/write)	117720	117720	0	0.0
			.bss	48928	48928	0	0.0
			.data	1608	1608	0	0.0
			.data.rel.ro	61592	61592	0	0.0
			.dynamic	592	592	0	0.0
			.got	4296	4296	0	0.0
			.init	27	27	0	0.0
			.init_array	656	656	0	0.0
			.rodata	168660	168660	0	0.0
			.text	1739506	1739506	0	0.0
	shell	debug	(read only)	2512873	2512873	0	0.0
			(read/write)	148912	148912	0	0.0
			.bss	67560	67560	0	0.0
			.data	848	848	0	0.0
			.data.rel.ro	74776	74776	0	0.0
			.dynamic	592	592	0	0.0
			.got	4160	4160	0	0.0
			.init	27	27	0	0.0
			.init_array	928	928	0	0.0
			.rodata	213714	213714	0	0.0
			.text	2139954	2139954	0	0.0
	thermostat-no-ble	arm64	(read only)	2344332	2344332	0	0.0
			(read/write)	150257	150257	0	0.0
			.bss	63169	63169	0	0.0
			.data	1136	1136	0	0.0
			.data.rel.ro	78184	78184	0	0.0
			.dynamic	560	560	0	0.0
			.got	4752	4752	0	0.0
			.init	24	24	0	0.0
			.init_array	368	368	0	0.0
			.rodata	144348	144348	0	0.0
			.text	1972832	1972832	0	0.0
	tv-app	debug	(read only)	2787073	2787073	0	0.0
			(read/write)	250488	250488	0	0.0
			.bss	165576	165576	0	0.0
			.data	3360	3360	0	0.0
			.data.rel.ro	75360	75360	0	0.0
			.dynamic	592	592	0	0.0
			.got	4672	4672	0	0.0
			.init	27	27	0	0.0
			.init_array	904	904	0	0.0
			.rodata	212363	212363	0	0.0
			.text	2395234	2395234	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2366708	2366708	0	0.0
			.bss	185092	185092	0	0.0
			.data	5792	5792	0	0.0
			.text	1329308	1329308	0	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1153039	1153039	0	0.0
			bss	135604	135604	0	0.0
			rodata	145608	145608	0	0.0
			text	793252	793252	0	0.0
p6	all-clusters-app	default	(read/write)	2512064	2512064	0	0.0
			.bss	118528	118528	0	0.0
			.data	2672	2672	0	0.0
			.text	1470328	1470328	0	0.0
	light-app	default	(read/write)	2413264	2413264	0	0.0
			.bss	111992	111992	0	0.0
			.data	2528	2528	0	0.0
			.text	1371528	1371528	0	0.0
	lock-app	default	(read/write)	2376944	2376944	0	0.0
			.bss	111736	111736	0	0.0
			.data	2488	2488	0	0.0
			.text	1335208	1335208	0	0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	798964	798964	0	0.0
			bss	70096	70096	0	0.0
			noinit	40416	40416	0	0.0
			text	568074	568074	0	0.0