RcsManager was handling both DB APIs and RcsFeature logic, which made it confusing. Instead, make RcsMessageStore->RcsMessageManager, which is a top level API. Test: Manual Change-Id: I9b9f96154d0705797cedade3d6cee27719897164
RcsManager was handling both DB APIs and RcsFeature logic, which made it confusing. Instead, make RcsMessageStore->RcsMessageManager, which is a top level API. Test: Manual Change-Id: I9b9f96154d0705797cedade3d6cee27719897164