Add satellite datagrams in DB.

The following changes are made in this CL:
- Created a new db file SatelliteDatagrams.db
- Created a datagrams table with two columns: datagram_id, datagram

Bug: 269637555
Test: atest com.android.providers.telephony.SatelliteProviderTest,
      Basic sanity, making calls and sending sms
Change-Id: Ia17d8e25d2c92af989bd2fdc020174afcbe7f6ab