move CellBroadcastMessage from telephony-common to app

1. add slotIndex in SmsCbMesage
2. move cellbroadcastMessage from telephony-common to app
next step, considering merging CellBroadcast to SmsCbMessage

Bug: 135956699
Bug: 141962867
Test: build & unit test
Change-Id: I07604101e3dccaa8e1539fa2644ef08da54d4533
(cherry picked from commit 515285b1)
Merged-in: I07604101e3dccaa8e1539fa2644ef08da54d4533