Allow wildcard(*) in config namespace

[mostafa-rz]

What problem does this feature proposal attempt to solve?

We can add a namespace to the config file and allow the lighthouse to search there for the classes. The namespaces can only be a folder and the class must be inside the folder. If the folder is nested then we have to add all of them. By adding wildcard functionality we can let the client just add the parent namespace, then we test the class name against all the files inside the main folder or nested folders.

|-- app
    |-- Models
        |-- Posts
            |--foo.php
        |-- Users
            |--bar.php
        |--baz.php

With the current solution:

'namespaces' => [
        'models' => ['App', 'App\\Models',  'App\\Models\\Posts',  'App\\Models\\Users'],
    ],

With the proposed feature:

'namespaces' => [
        'models' => ['App', 'App\\Models\\*'],
    ],

Which possible solutions should be considered?

If the wildcard exists in the namespace, then get all the directories inside the path with $fileSystem->directories($path). Try this again for the nested folders. Forming and testing the existence of the class will be the same as before.

Open questions

1. Is there any predefined way to convert a namespace to the path?
2. If the answer is no for 1, based on the PSR-4, are these correct?

Namespace	Path
App\Models\*	app/Models
App\Models\Posts\*	app/Models/Posts

[spawnia]

I might merge a pull request for this, given it is simple enough to implement and does not hurt performance.