Use new compiler resolvePath option

[bluwy]

Changes

• Remove some old code we had for resolving paths and metadata creation
• Remove CSS module patch in vite-plugin-css to fix .css?raw usage
• Remove export const $$metadata from Astro files (discussed with Nate that it's fine as it's internal API)
• Remove createMetadata export from astro/runtime/server as the compiler doesn't use it anymore

Question:

1. Is astro/runtime/server public API? Should I bring back a stub of createMetadata?

Note:

1. One side-effect of the compiler import * removal is that esbuild would treeshake unused imports away, so I have to update some error tests to reference the variable to test correctly.

Testing

All existing tests should pass for this refactor.

I added a test for the .css?raw fix.

Docs

N/A. This change should be transparent.

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[matthewp]

Is astro/runtime/server public API? Should I bring back a stub of createMetadata?

No, at least not that part. Some of the rendering stuff like renderComponent is a bit more murky.