Refactor GrantPermissions, introduce GrantBehaviors

Refactor the GrantPermissionsViewModel. Move any group specific behavior
to a list of GrantBehaviors, which determine if a request is considered
granted, if it's considered fixed, and determines what type of prompt
and deny behavior should show. These prompts are enumerated explicitly,
and should be much more human understandable.

Bug: 284183336
Test: atest CtsPermission3TestCases
Change-Id: I29c4ee20ecec4d89b485ffeedeea52adfb573ae1