feat: add Svelte language support

[yilanboy]

This PR adds a Svelte language support that extends HTML and injects TypeScript.

It also includes two small JS/TS pattern changes that are technically out of scope, but were required for Svelte (and TypeScript in general) to highlight correctly. They are scoped narrowly and covered by tests.

What's in the PR

Svelte 5 language (in scope)

• Support Runes like $state(), $derived, $effect, etc.
• Support expression like {expression}.
• Support block keyword like {#if}, {:else}, {/each}, {@const}, etc.
• Support directives like bind:value.

Out-of-scope but necessary

• JsMethodPattern allows $: Required for Svelte 5 runes ($state(), $derived(), $effect(), …). Also correct for plain JS ($()).

// before
return '(?<match>[\w]+)\(';
// after
return '(?<match>[\w\$]+)\(';

• New TsMethodPattern: matches name<Generics>( so createList<Todo[]>(initial) highlights the method name. The existing TsGenericPattern was consuming <…> first and leaving the method name unstyled.

// make 'createList' can be render as a function, even it is in front of the generic syntax
createList<Todo[]>(initial)

[github-actions]

Benchmark Results

Comparison of add-svelte-language-support against main (fe0107137025b90260aee80128cc4e46071541ff).

Open to see the benchmark results

benchmark	subject	set	revs	its	mem_peak	mode	rstdev
HighlighterBench	benchParse	apache	100	5	2.045mb +0.26%	72.694305μs +0.03%	±0.41% -56.45%
HighlighterBench	benchParse	bash	100	5	2.077mb +0.26%	206.412192μs +0.10%	±0.75% +169.43%
HighlighterBench	benchParse	bbcode	100	5	2.041mb 0.00%	74.277965μs +0.13%	±0.33% -55.56%
HighlighterBench	benchParse	blade	100	5	2.649mb +2.70%	1,090.161996μs +0.25%	±1.08% +31.51%
HighlighterBench	benchParse	css	100	5	2.063mb +0.26%	139.495010μs +0.25%	±0.55% -62.58%
HighlighterBench	benchParse	diff	100	5	2.043mb 0.00%	26.936732μs +0.66%	±0.74% +6.96%
HighlighterBench	benchParse	dockerfile	100	5	2.045mb +0.26%	88.669178μs +0.54%	±0.87% -1.68%
HighlighterBench	benchParse	dotenv	100	5	2.049mb +0.26%	77.057397μs -0.69%	±0.64% -5.93%
HighlighterBench	benchParse	gdscript	100	5	2.143mb +0.25%	330.076458μs +0.03%	±0.47% +17.80%
HighlighterBench	benchParse	graphql	100	5	2.064mb +0.26%	150.800685μs -0.35%	±0.43% -41.60%
HighlighterBench	benchParse	html	100	5	2.067mb +0.26%	116.195890μs +0.04%	±0.53% -2.97%
HighlighterBench	benchParse	ini	100	5	2.052mb +0.26%	86.178376μs +1.12%	±0.44% -33.94%
HighlighterBench	benchParse	javascript	100	5	2.131mb +0.28%	270.614110μs -0.36%	±0.38% -50.81%
HighlighterBench	benchParse	json	100	5	2.106mb +0.25%	236.552642μs +0.20%	±0.34% -44.16%
HighlighterBench	benchParse	markdown	100	5	2.054mb +0.26%	75.138141μs +0.02%	±1.06% -2.85%
HighlighterBench	benchParse	nginx	100	5	2.118mb +0.25%	266.195479μs +0.69%	±0.60% +19.14%
HighlighterBench	benchParse	php	100	5	2.410mb +0.22%	754.486791μs +0.52%	±0.54% -18.32%
HighlighterBench	benchParse	python	100	5	2.307mb +0.23%	419.350313μs -0.06%	±0.80% +112.12%
HighlighterBench	benchParse	scss	100	5	2.079mb +0.26%	184.538200μs +1.11%	±0.54% +36.36%
HighlighterBench	benchParse	sql	100	5	2.079mb +0.26%	157.600685μs +0.28%	±0.61% -39.12%
HighlighterBench	benchParse	svelte	100	5	ERR	1,060.223679μs +0.00%	±0.85% +0.00%
HighlighterBench	benchParse	terminal	100	5	2.074mb +0.26%	195.069041μs +0.46%	±0.34% -38.91%
HighlighterBench	benchParse	terraform	100	5	2.078mb +0.26%	172.979609μs -0.38%	±0.47% +49.10%
HighlighterBench	benchParse	typescript	100	5	2.500mb +0.35%	248.381996μs +1.47%	±0.45% -60.78%
HighlighterBench	benchParse	twig	100	5	19.185mb +0.03%	1,458.715695μs +0.51%	±1.54% +12.48%
HighlighterBench	benchParse	xml	100	5	2.082mb +0.26%	177.034971μs +0.34%	±0.59% +14.15%
HighlighterBench	benchParse	yaml	100	5	2.139mb +0.25%	316.960235μs -1.42%	±0.61% -31.41%

_{Generated by phpbench against commit 6bbca79}