Move DialerCall.State to an independent package.

This refactoring will remove dependency on incall/call package for those classes only dependent on DialerCall.State.
The benefit is to remove unnecessary dependency and avoid potential loop dependency in the future.

Test: presubmit
PiperOrigin-RevId: 194594382
Change-Id: I6b3241bcf10a0a15c495c3c90a13f174c32e3f72
20 files changed