fix(paper): prevent freeze on layout update during transition

[krozniata]

Summary

This PR fixes issue causing component to freeze when layout was updated during transition - old arch

When layout was updated e.g. because of hiding keyboard, setViewControllers completion block was never called, which resulted in swipe being disabled

It fixes this issue by adding custom shadow view and preventing layout update during transition phase

Fixes #922

Test Plan

1. Build the example app.
2. Go to the Keyboard Example menu.
3. Touch the TextInput to show the keyboard.
4. Press the Next page button. (might be required to modify ControlPanel to move button above keyboard)
5. Should navigate correctly, should be able to interact

Other examples should work as before

Compatibility

OS	Implemented
iOS	✅
Android	❌

[MrRefactor]

Fixes #922