Specify transition for FAB

[GordonBlahut]

Is your feature request related to a problem? Please describe.
I would like to be able to animate FAB actions like this example from Google:
https://storage.googleapis.com/spec-host/mio-staging%2Fmio-components%2F1579302979877%2Fassets%2F1CMssxsx--CjFfG_JIw35cPRhxJldwRWM%2Ffab-toolbar-speeddial-v03.mp4

Describe the solution you'd like
Ability to specify show/hide transitions for QFab just like QMenu. Also the ability for specify QFAbActions' animation origin and possibly animate each QAction slightly progressive delay like the video above.

Describe alternatives you've considered
The ability to disable the animation could also be another solution, as long as we could then wrap QFabActions in custom transitions that could be triggered on QFab show/hide.

Additional context
The default QFab animation is actually pretty close, but once you use expanded QFabActions with labels, it may look nicer (entirely subjective) for them to scale in place instead of from the QFab.