feat: add new experimental Rust compiler

[Princesseuh]

Changes

Adds a new experimental flag to use the Rust compiler instead of the Go one. This requires users to install @astrojs/compiler-rs in their project manually.

Testing

I edited some tests so that they pass on both the old and the new compiler:

• Two tests had invalid HTML
• LightningCSS does some CSS stuff slightly differently, and not all the minification options are currently enabled in the new compiler because of some issues so I had to change the asserts

Apart from that, I believe that all tests pass on both compilers.

Docs

There's a JSDoc and withastro/docs#13303

[changeset-bot]

🦋 Changeset detected

Latest commit: 1255d5f

The changes in this PR will be included in the next version bump.

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[codspeed-hq]

Merging this PR will not alter performance

✅ 18 untouched benchmarks

---

_{Comparing feat/rust-compiler (fc2b0bf) with main (35bc814)¹}

Footnotes

1. No successful run was found on main (3252a25) during the generation of this report, so 35bc814 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[ematipico]

I can't see where tests are updated. I don't see tests that use the new experimental flag

[Princesseuh]

I can't see where tests are updated. I don't see tests that use the new experimental flag

There are no tests using the flag, I just updated them so that they can run in local. I can add a test using it, I guess

[ematipico]

Yes please, I would like to see some tests. Especially the error around unclosed tags, which is part of the expectations of the new compiler

[sarah11918]

RUST. RUST. RUST. Incrabible work, @Princesseuh !

Just a sample of what I think we could add to the changeset that I think is helpful!

[sarah11918]

Noting that it's expected that there's no @docs tag here for an experimental feature! Everything is documented on the experimental docs page!

[sarah11918]

Approved by me! Ready for @yanthomasdev !

[yanthomasdev]

Looks good to me, just two small nits and we are done! 🦀