[Android] App Links support

[wcoder]

The default implementation of BackStackManager blocked handling app links, will be thrown an exception:

XToolkit.WhiteLabel/Softeq.XToolkit.WhiteLabel/Navigation/BackStackManager.cs

Lines 54 to 55 in 2a2b9f1

	throw new ArgumentException(
	$"Couldn't find ViewModel for type: {typeof(TViewModel)}. " +