move CellBroadcastMessage from telephony-common to app

1. add slotIndex in SmsCbMesage(cellbroadcast can be received
when sim is absent)
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: Iba5e727fc1a1adaf44a7fa1eebfefe34fa8644aa