refactor(parse/html): split HtmlName into HtmlTagName and HtmlAttributeName

[dyc3]

Summary

Does what it says in the title. The reason for this change is that there are different rules for tag names and attribute names when normalizing the casing, and this will help resolve those things.

Test Plan

Snapshots updated.

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	50388	50388	0
Passed	49073	49073	0
Failed	1315	1315	0
Panics	0	0	0
Coverage	97.39%	97.39%	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	6641	6641	0
Passed	2229	2229	0
Failed	4412	4412	0
Panics	0	0	0
Coverage	33.56%	33.56%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	798	798	0
Passed	706	706	0
Failed	92	92	0
Panics	0	0	0
Coverage	88.47%	88.47%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	18658	18658	0
Passed	14309	14309	0
Failed	4349	4349	0
Panics	0	0	0
Coverage	76.69%	76.69%	0.00%

[ematipico]

Very straightforward! I suppose we'll see the results of the refactor soon :)

[codspeed-hq]

CodSpeed Performance Report

Merging #5267 will not alter performance

_{Comparing html-split-tag-attr-names (111dc19) with main (b9d438b)}

Summary

✅ 97 untouched benchmarks