IF: net: Add extra logging around async write

[heifner]

Add additional debug logging around async write.
Make all logs that contain a connection id use a prefix of - so they are easy to grep for in the log.

debug 2024-03-28T20:58:09.489 net-2     net_plugin.cpp:2654           operator()           ] socket_is_open true, state connected, syncing false, connection - 4

The - matches default output of peer_* logging:

debug 2024-03-28T20:58:09.489 net-0     net_plugin.cpp:2668           operator()           ] ["localhost:9876 - b648e56" - 4 127.0.0.1:9876] bcast block 7

Should help verify issue of #2354 and #2351.

[ericpassmore]

Note:start
group: IF
category: INTERNALS
summary: Add additional debug logging around async write. To make log grep easier, all logs with connection id now contain prefix of - .
Note:end