Provide API for making navigation via ViewInterface

[mykola-dev]

Hi Jakub!
After some research of your lib, i realized that navigation between screens is not very handy when it done from viewModel (especially when navigation step contains transitions/animations, better to leave this stuff inside activity/fragment). It would be nice to have ability to navigate via ViewInterface. Something like ViewInterface.navigate(params). And then implement navigate method in the Activity/Fragment/Dialog etc.
Please take a look on this proof of concept
mykola-dev@79e66df
Is it worth of pull request?