fix: reload content on collections change

[Princesseuh]

Changes

This reworks a bit how we handle reloading schemas and add support for reloading the entire collections config. This PR focuses on fixing the language server handling of it, the TypeScript plugin part isn't as problematic, the only thing it doesn't handle is new collections being added, file updates works correctly (since they only care about the .ts part, not the schema)

Testing

I added a (1) test, this is generally hard to test because there's so many moving parts to it, the editor seeing the file changes, Astro reloading the file etc.

The one test should at least make sure the general idea for updating schemas works

Docs

N/A

[changeset-bot]

🦋 Changeset detected

Latest commit: 534da57

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

This PR includes changesets to release 3 packages

Name	Type
@astrojs/language-server	Patch
@astrojs/ts-plugin	Patch
astro-vscode	Patch

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