Update datagram transfer state.

The following changes are made in this CL:
- Removed onDatagramTransferStateChanged() callback
- Added onSendDatagramStateChanged() callback
- Added onReceiveDatagramStateChanged() callback.

Bug: 269637555
Test: atest SatelliteManagerTest, Flashed build on raven-userdebug: calls and SMS are working.
Change-Id: I339bf7a06208ede7b70b2a8a4ad657f77e3bd2cb