Python testing: Add PICS, helpers, and tests

[cecille]

Adds some helper functions to the python matter test runner. These are going to be used to support the time sync cluster, which cannot be run though YAML (requires flow control and access to time), and cannot be run manually because it is checking time tolerances.

Adds:

• ability to specify a PICS file on the command line for the script using --PICS and a check function (test for PICS parsing / checking also added)
• ability to get system time in the matter epoch (tests for time also added)
• type checking function (required by the test plan for some attrs - added by default)

[github-actions]

PR #26399: Size comparison from c8e453c to 223442c

Decreases (1 build for cc32xx)

platform	target	config	section	c8e453c	223442c	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	19609756	19609755	-1	-0.0

Full report (1 build for cc32xx)

platform	target	config	section	c8e453c	223442c	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	605090	605090	0	0.0
			(read/write)	204164	204164	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197576	197576	0	0.0
			.comment	206	206	0	0.0
			.data	1468	1468	0	0.0
			.debug_abbrev	957621	957621	0	0.0
			.debug_aranges	101136	101136	0	0.0
			.debug_frame	341512	341512	0	0.0
			.debug_info	19609756	19609755	-1	-0.0
			.debug_line	2666632	2666632	0	0.0
			.debug_line_str	513	513	0	0.0
			.debug_loc	33340	33340	0	0.0
			.debug_loclists	1489225	1489225	0	0.0
			.debug_ranges	4984	4984	0	0.0
			.debug_rnglists	94315	94315	0	0.0
			.debug_str	3108982	3108982	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104354	104354	0	0.0
			.shstrtab	265	265	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	483384	483384	0	0.0
			.symtab	287328	287328	0	0.0
			.text	498612	498612	0	0.0

[github-actions]

PR #26399: Size comparison from 5471bca to 16dc064

Full report (1 build for cc32xx)

platform	target	config	section	5471bca	16dc064	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	605002	605002	0	0.0
			(read/write)	204164	204164	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197576	197576	0	0.0
			.comment	206	206	0	0.0
			.data	1468	1468	0	0.0
			.debug_abbrev	957619	957619	0	0.0
			.debug_aranges	101232	101232	0	0.0
			.debug_frame	342080	342080	0	0.0
			.debug_info	19674627	19674627	0	0.0
			.debug_line	2671903	2671903	0	0.0
			.debug_line_str	513	513	0	0.0
			.debug_loc	33340	33340	0	0.0
			.debug_loclists	1491139	1491139	0	0.0
			.debug_ranges	4984	4984	0	0.0
			.debug_rnglists	94412	94412	0	0.0
			.debug_str	3131828	3131828	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104314	104314	0	0.0
			.shstrtab	265	265	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	483089	483089	0	0.0
			.symtab	287232	287232	0	0.0
			.text	498564	498564	0	0.0