Metrics: Log L2CAP and RFCOMM socket connection state changes to statsd

* Log L2CAP LE Coc, L2CAP BREDR, and RFCOMM socket connection state
  changes, including port number, socket type, connection states,
  number of bytes sent and received, server port number, uid of socket
  owner
* Address is empty if this is a server port

Bug: 112969790
Test: make, test drive with statsd
Change-Id: Ic0ee93a6d9e4fa4109ddb89dea5e92907c49f2fc