feat: Support FAB tab page MD transitions

[JasonAsmk]

Feature Request

Ionic version:
4.11.4

Describe the Feature Request
As of 4.11.4, there's no apparent way to follow the material design guidelines on how a FAB should animate when changing tabs, to give the impression that it's not multiple FABs but a single one.

Describe Preferred Solution
This is the transition according to MD:

It would be great to have this animation in Ionic. Even better if it's router/tab aware.

Describe Alternatives*
A more simple solution would be to add this animation and offer a hook to control it.

[masimplo]

Just wanted to add that this also true about page to page transitions as well, not just tabs.