improve map conformance without losing perf

[neeldug]

Improves conformance but avoids following spec directly for performance implications.

[neeldug]

Test262 conformance changes:

Test result	master count	PR count	difference
Total	80,804	80,804	0
Passed	32,992	33,006	+14
Ignored	15,896	15,896	0
Failed	31,916	31,902	-14
Panics	0	0	0
Conformance	40.83%	40.85%	+0.02%

Fixed tests (14):

test/built-ins/Map/prototype/get/returns-value-normalized-zero-key.js [strict mode] (previously Failed)
test/built-ins/Map/prototype/get/returns-value-normalized-zero-key.js (previously Failed)
test/built-ins/Map/prototype/forEach/first-argument-is-not-callable.js [strict mode] (previously Failed)
test/built-ins/Map/prototype/forEach/first-argument-is-not-callable.js (previously Failed)
test/built-ins/Map/prototype/set/replaces-a-value-normalizes-zero-key.js [strict mode] (previously Failed)
test/built-ins/Map/prototype/set/replaces-a-value-normalizes-zero-key.js (previously Failed)
test/built-ins/Map/prototype/set/append-new-values-normalizes-zero-key.js [strict mode] (previously Failed)
test/built-ins/Map/prototype/set/append-new-values-normalizes-zero-key.js (previously Failed)
test/built-ins/Map/prototype/clear/context-is-not-map-object.js [strict mode] (previously Failed)
test/built-ins/Map/prototype/clear/context-is-not-map-object.js (previously Failed)
test/built-ins/Map/prototype/clear/context-is-set-object-throws.js [strict mode] (previously Failed)
test/built-ins/Map/prototype/clear/context-is-set-object-throws.js (previously Failed)
test/built-ins/Map/prototype/clear/context-is-not-object.js [strict mode] (previously Failed)
test/built-ins/Map/prototype/clear/context-is-not-object.js (previously Failed)

[Razican]

Hello @neeldug ! thank you for the contribution and sorry for the delay in the review. It seems this requires a rebase, and it seems to be failing some clippy checks.

[jedel1043]

Some more changes and questions.

[neeldug]

@jedel1043 Did check and it's unnecessary for delete, and for clear this should work, couldn't find a clean way to replace the reference with a new map so went into OrderedMap to create a method.

[jedel1043]

Small nitpicks. We can merge it after this gets fixed :D

[jedel1043]

Great work!