Add support for pretty URLs

[javiereguiluz]

A quick example is worth a thousand words:

// Before
https://example.com/admin?crudAction=edit&crudControllerFqcn=App%5CController%5CAdmin%5CPostCrudController&entityId=3874

// After
https://example.com/admin/post/3874/edit

• Read the updated docs in the PR to learn more about this feature.
• This PR still needs some minor changes (e.g. I'll add an interface for the new AdminRouteGenerator class, etc.) but it's ready for test it.

[javiereguiluz]

Update: we generated all routes for all controllers + actions on all dashboards. If you have just one dashboard, that's fine.

But, if you have many, it's common that you only let certain controllers in some of those dashboards (think of a "guest dashboard" or "external collaborator" dashboard that only includes a few links in the menu to manage a subset of all your crud controllers).

Although this is not a security issue because you can restrict actions in many ways .... I think it's better to not generate the routes for the controllers that cannot be accessed on some dashboards. So, we just added a feature to configure that. See the previous commit and the docs included in it.

[Seb33300]

I have few questions:

• in the same way we can define the title of a Crud, is there any chance we could define the slug/path too?
• we can have multiple crud for the same entity, did you handle that case? (previous question may be a way to handle it)
  Just checked the code and the path is based on the crud class name, not on the entity so it's fine!

[Seb33300]

Remove useless construct?