Prevent locking up when encountering invalid CSS

[matthewp]

Changes

• The compiler uses preprocessStyles to transform styles into valid CSS which it then uses for scoping.
• When we are unable to preprocess a style we were returning null. Since the compiler still needs to process the styles it would try to process invalid CSS and lock up.
• The core change is in the compiler which gracefully handles errors and returns them back in the TransformResult.
• This change also refactors the Astro compilation process to be moved into a separate module with a more refined API, leaving the Vite parts to remain within the Vite plugin.
• When any style errors occur the compilation function throws an AggregateError.
• Closes Astro hangs on invalid scss #4615

Testing

• Unit test added

Docs

N/A, bug fix

[changeset-bot]

🦋 Changeset detected

Latest commit: f691080

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

This PR includes changesets to release 16 packages

Name	Type
astro	Patch
@e2e/astro-component	Patch
@e2e/error-cyclic	Patch
@e2e/error-react-spectrum	Patch
@e2e/error-sass	Patch
@e2e/errors	Patch
@e2e/hydration-race	Patch
@e2e/lit-component	Patch
@e2e/preact-component	Patch
@e2e/react-component	Patch
@e2e/solid-component	Patch
@e2e/solid-recurse	Patch
@e2e/svelte-component	Patch
@e2e/e2e-tailwindcss	Patch
@e2e/ts-resolution	Patch
@e2e/third-party-astro	Patch

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[natemoo-re]

Looks great! Nice refactors!