refactor(js_semantic): use u32 for scope id

[Conaclos]

Summary

This is a minor refactor to use u32 instead of usize for scope identification.

Test Plan

CI must pass.

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	48223	48223	0
Passed	47026	47026	0
Failed	1197	1197	0
Panics	0	0	0
Coverage	97.52%	97.52%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	40	40	0
Passed	37	37	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.50%	92.50%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	6538	6538	0
Passed	2149	2149	0
Failed	4389	4389	0
Panics	0	0	0
Coverage	32.87%	32.87%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	669	669	0
Passed	597	597	0
Failed	72	72	0
Panics	0	0	0
Coverage	89.24%	89.24%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	18250	18250	0
Passed	13987	13987	0
Failed	4263	4263	0
Panics	0	0	0
Coverage	76.64%	76.64%	0.00%