transport/tcp: Basic message-passing benchmarks.
transport/tcp: Basic message-passing benchmarks.

Adds basic message passing benchmarks compares the send and receive
overhead added on to manual TCP connection.

⨯ Connection setup (mocked with net.Pipe)
✓ Variable serialisation (gob)
⨯ Message delimit (only relevant in real async TCP stream)
✓ Message sending and receiving
✓ Variable de-serialisation (gob)

dcastrop/scribble-go,nickng/scribble-go,nickng/scribble-go,dcastrop/scribble-go