Add connect event reporting

Adds reporting of connect events including netId, destination IP address,
destination port, uid and connect latency.

Also enables the relevant tests in the connect_benchmark.

Currently ignores the new data it receives, further work will be
done in the subsequent CLs.

Test: for now just the benchmarking, in the future CTS

Bug: 29748723
Change-Id: Id9819552a6d9ad5efc1aff5262d44caa994952aa