Add wrapper around androidTransitionMutator to support generic blueprint.TransitionInfo

Make the TransitionMutator interface use a generic T to pass a
typesafe object that implements blueprint.TransitionInfo as the
transition configuration.  Add VariationTransitionMutator as a
verison of TransitionMutator that uses a string as the info object.

Bug: 372543712
Test: all soong tests pass
Change-Id: I6e5e17f0e272665bc2e9a46d0ac6f0011b9f5d59