refactor(useFilenamingConvention): support dynamic route filenames

[Conaclos]

Summary

Fix #3465

I had to modify the way we generate test names. To have a more robust approach, we now rely on biome_string_case case conversion. I had to change some test name to accommodate with this change.

Test Plan

I added four tests.

[ematipico]

Any chance we can support SolidStart too? They use a different approach... 😓

https://docs.solidjs.com/solid-start/building-your-application/routing#renaming-index

[codspeed-hq]

CodSpeed Performance Report

Merging #3466 will not alter performance

_{Comparing conaclos/useFilenamingConvention-3465 (46f6378) with main (ff6a9a1)}

Summary

✅ 104 untouched benchmarks

[Conaclos]

Any chance we can support SolidStart too? They use a different approach..

I will take a look.
All these syntaxes are so ugly to my eyes.

[ematipico]

All these syntaxes are so ugly to my eyes.

Ehehe, you're aren't wrong 😅

[minht11]

Just to add svelte kit also uses +page@(app).svelte to escape layout https://kit.svelte.dev/docs/advanced-routing#advanced-layouts-page

[Conaclos]

+page@(

Is (app) a placeholder?

Just to add svelte kit also uses +page@(app).svelte to escape layout https://kit.svelte.dev/docs/advanced-routing#advanced-layouts-page

Could you detail the syntax?

• Is page/layout fixed strings? or is it the name of the page/layout?
• If I understand corerctly, the part behind @ is optional?
  Are (app)/[id] placeholders or are app/id placeholders?

[minht11]

Anything after @ is just regular route name, it tells from which route above it should inherit nested layout. +page@(app) just means that layout should break out to (app) above. @ is optional and advanced feature.

I also think this should be supported only for svelte files since it is quite unusual syntax. I am not 100% garunateed, but I can't find anything for non svelte files on search. svelte files using that pattern for reference.

[Conaclos]

I am going to merge this PR. I will consider extending the rule with a configuration to customize the accepted patterns.