feat: Add Route Groups [WIP]

[janus-reith]

Changes

This aims to add Route Groups, as known from Next.js and requested here: withastro/roadmap#480

Folder names in (parenthesis) should be excluded from the route structure, but their content should not be.

This can especially be helpful with boilerplates to encapsulate some of the logic.

Testing

Some tests should be added for sure. I had a quick look at packages/astro/test/route-manifest.test.js but they are all commented out.

I did some quick manual testing to check that it works as expected, however can't rule out that there have been major oversights since I didn't dig trough the whole codebase.

Docs

Docs should be added for this, probably a small passage in https://docs.astro.build/en/guides/routing/
As this this should not clash with any existing route logic, this could hopefully be kept rather short

[changeset-bot]

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Latest commit: c4c0422

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[codspeed-hq]

CodSpeed Performance Report

Merging #13148 will not alter performance

_{Comparing janus-reith:feat/route-manifest-add-route-groups (c4c0422) with main (d1384b8)}

Summary

✅ 6 untouched benchmarks