[✨] Add ability to customize the "@" symbol for defining the layout name for a route

[Raiondesu]

Is your feature request related to a problem?

Some environments, build systems, or code linting configs may reject or misinterpret the @ used as a layout name marker in the route name. Same can be said of some other directory structure mandates in qwik-city.

Describe the solution you'd like

An ability to customize at least the layout name marker using the qwik-city options object.

Something like this:

import { defineConfig } from 'vite';
import { qwikVite } from '@builder.io/qwik/optimizer';
import { qwikCity } from '@builder.io/qwik-city/vite';
import tsconfigPaths from 'vite-tsconfig-paths';

export default defineConfig(() => {
  return {
    plugins: [
      qwikCity({
        structure: {
          layoutNameMarker: ':' /// Now it's possible to set layout names with `index:layout-name.tsx`
        }
      }),
      qwikVite(),
      tsconfigPaths()
    ],
  };
});

Describe alternatives you've considered

Maybe it would have been possible to allow the route to provide the layout export, like with the request handlers (onGet, onRequest, etc.), but this would overclutter the route file even more while also removing the feature of knowing the layout for the route at a glance in the file explorer when utilizing this approach.

Additional context

No response

[gioboa]

We moved this issue to qwik-evolution repo to create a RFC discussion for this.
Here is our Qwik RFC process thanks.