Support pushing a Fragment using Fragment class

[rciovati]

• The current FragmentController#pushFragment method allows only pushing passing a Fragment instance. A more recent version of the AndroidX Fragment lib supports adding/replacing Fragments by their classes so that the FragmentFactory is used. This allow developers to control how fragments are instantiated.
• This change introduces an additional FragmentController#pushFragment that receives the Fragment class and the arguments so that developers can also use FragmentFactory

[rciovati]

@ncapdevi what do you think about this one?