feat(noUselessEscapeInRegex): add rule

[Conaclos]

Summary

Implement partially #1090

Test Plan

I added all the tests of the ESLint rules.
We have a single divergence: we report \k as useless in non unicode-aware regexes.

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	48473	48473	0
Passed	47276	47276	0
Failed	1197	1197	0
Panics	0	0	0
Coverage	97.53%	97.53%	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	6551	6551	0
Passed	2199	2199	0
Failed	4352	4352	0
Panics	0	0	0
Coverage	33.57%	33.57%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	670	670	0
Passed	598	598	0
Failed	72	72	0
Panics	0	0	0
Coverage	89.25%	89.25%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	18334	18334	0
Passed	14027	14027	0
Failed	4307	4307	0
Panics	0	0	0
Coverage	76.51%	76.51%	0.00%

[codspeed-hq]

CodSpeed Performance Report

Merging #3604 will improve performances by 6.75%

_{Comparing conaclos/noUselessEscapeInRegex (9a56c36) with main (2f8a37f)}

Summary

⚡ 1 improvements
✅ 103 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	conaclos/noUselessEscapeInRegex	Change
⚡	react.production.min_3378072959512366797.js[cached]	2 ms	1.9 ms	+6.75%

[arendjr]

Nice one, good diagnostics too! Just some nits on the wording.