fix: return ast from compile

[dummdidumm]

Was returned from Svelte 4's compile method, and language tools uses it in various places for perf reasons (not doing double parses unnecessarily if you need both)

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Name	Status	Preview	Comments	Updated (UTC)
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[dummdidumm]

Mhm wait this is incomplete, it also needs to have an option which AST to return in this case. Mhhhhhhhhhhhhhhhhm. Maybe it's better to instead change the API so that compile can also take an AST, skipping the work. Then again, language tools would have the old AST but the compiler would require the new one. Gah, this is stupid.

[Rich-Harris]

#11191 was merged, closing