Binding dependencies for separate class methods to Service Container.

[rela589n]

Let's imagine application, with master-slave replication.

We have master and slave databases and thus `MasterFilesRepository` works with master and `SlaveFilesRepository` works with slave one.

In our controller methods depend on `FilesRepository` interface, which is implemented by classes described above.

final class FilesController extends Controller
{
    public function index(FilesRepository $filesRepository) // works with slave database
    {
        return view('pages.client.dashboard.files.index', [
            'files' => $filesRepository->all()
        ]);
    }

    public function edit(int $id, FilesRepository $filesRepository) // works with master database
    {
        return view('pages.client.dashboard.files.edit', [
            'file' => $filesRepository->find($id)
        ]);
    }
}

It would be wonderful to write like so:

$app->when(FilesController::class)
    ->method('index')
    ->needs(FilesRepository::class)
    ->give(SlaveFilesRepository::class);

$app->when(FilesController::class)
    ->method('edit')
    ->needs(FilesRepository::class)
    ->give(MasterFilesRepository::class);