Add TestApi annotation on PhoneAccountSuggestionService and add sensible
equals and hashCode methods to PhoneAccountSuggestions
Bug: 111455117
Test: CTS
Change-Id: I112e350cc637cb086252c53be5e08596e743537d
Add docs to some constants in PhoneAccountSuggestion and add @TestApi
annotations to enable CTS testing for the new APIs.
Test: compiles
Bug: 111455117
Change-Id: I2b55a411ff4f0da37eefa0996f7316ea53bca41d