Adding basic logging for the message db and message events

This adds info/dump logging for:
- How far we got in connecting (sdp started/complete)
- When we received an event from the remote (new message, message sent)
- When we received a list of messages (initial download/listing)
- When we received a message's full content (new message AND message
  downloads)
- When we store a message (mmssms.db integration)
- The state of the message database and whether there's messages in the
  DB, split up between the various subscription IDs/Devices. (dump())

Tag: #refactor
Bug: 266742757
Test: atest BluetoothInstrumentationTests
Change-Id: I0d60832f674563ac6189c8dde0378f48efc6c56f