feat: update the route file format to allow for using route factories

[boazpoolman]

What does it do?

It updates the format for the route files which are generated from the init command.

Old format:

server/src/routes/
├── index.ts
├── content-api.ts
└── admin.ts

New format:

server/src/routes/
├── index.ts
├── content-api/index.ts
└── admin/index.ts

Why is it needed?

This change is needed to allow the use of route factories in plugins. By creating this nested structure we allow the user to create files like this:

server/src/routes/content-api/page.ts:

/**
 * page router
 */

import { factories } from '@strapi/strapi';

export default factories.createCoreRouter('plugin::my-plugin.page');

These core routes can then be used in the index file like this:

server/src/routes/content-api/index.ts:

import page from './page';

export default () => ({
  type: 'content-api',
  routes: [
    ...page.routes,
  ],
});

How to test it?

Using the core routers is out of the scope of this PR. This PR simply updates the structure to allow this at a later stage. So to test this PR you should test if the new format as described above still works as expected.

Related issue(s)/PR(s)

Possibly related to #90

[changeset-bot]

🦋 Changeset detected

Latest commit: 5a2fb62

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

This PR includes changesets to release 1 package

Name	Type
@strapi/sdk-plugin	Minor

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[sonarqubecloud]

Quality Gate failed

Failed conditions
100.0% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud