Improve MediaController

[StaehliJ]

As a user / integrator I can easily get a MediaController or MediaBrowser instance.

Context

Creating a MediaController or a MediaBrowser can be a pain in the neck. The usage of ListenableFuture and knowing how to do it is a bit hard. Another problem is the custom function and listener added by Pillarbox than can be called from theses instances.

### Actual code to be done

val builder : MediaController.Builder = ...
val future: ListenableFuture<MediaController> = builder.buildAsync()
future.addListener(() -> {
    try {
        val controller:MediaController = future.get()
        // The session accepted the connection.
        } catch (e:ExecutionException) {
             if (e.getCause() is SecurityException) {
             // The session rejected the connection.
             }
        }
     }, ContextCompat.getMainExecutor())
}

Proposition

Integrators can fetch a custom MediaController with a suspend function.

scope.launch() {
    val controller  =  PillarboxMediaController.Builder(...).buildAsnc()
    doSomethingWithController(controller)
}

Acceptance criteria

• MediaController instance can be created with one suspend function
• MediaBrowser instance can be created with one suspend function.

Tasks

• ...