refactor: move stubs to inertia/ directory

[Julien-R44]

We move to a new file structure for inertia apps :

• All code related to inertia will now be located in ./inertia folder instead of ./resources/
• We group app initialization files to ./inertia/app folder
• We have now a @adonisjs/tsconfig/tsconfig.client.json from which we extends. it is a more clean
• Use Inertia in exception handler instead of edge
• Automatically add two server_error and not_found component pages

[RomainLanz]

As discussed with @thetutlage, I believe we should also rename root to inertia_layout.edge too.