Implement a global theme to be easily configured in Dialer.

deleted several colors and unified them across the app
migrated several alert dialogs to support alert dialogs
added many todos
migrated several tests from GoogleRobolectricTestRunner to RobolectricTestRunner
Because of the test migration:
 - moved dialpad theme attributes into dialpad/theme
 - moved incall ui theme attributes into incallui/theme

Bug: 79883035
Test: tap
PiperOrigin-RevId: 197246477
Change-Id: Ifc534793bc32757bbbf2007a7c40287c8d0817ad