Move public methods of ResolverComparator to abstract class.

The public methods of ResolverComparator are moved to
AbstractResolverComparator. The original implementation is moved to
subclass ResolverRankerServiceResolverComparator. Next on the
agenda is to move more of the common functionality to
AbstractResolverComparator.

Bug:129014961
Test: atest frameworks/base/core/tests/coretests/src/com/android/internal/app
      Tests pass except WindowDecorActionBarTest https://paste.googleplex.com/6680684066242560
      Also manually tested text, image, no matching apps, browsable/URI
Change-Id: I8bd4e923b448c6f9d4e55cc0d15f74752f42b85d