Added Satellite Messaging APIs.

The following apis are added in this CL:
- registerForSatelliteStateChange()
- unregisterForSatelliteStateChange()
- registerForSatelliteDatagram()
- unregisterForSatelliteDatagram()
- getPendingSatelliteDatagrams()

Bug: 260896985
Test: atest SatelliteManagerTest
Change-Id: Ice9e97f61a6adffbab8ee53dea3b54a8d12ce174