Remove unused dependencies (gnet/v2 and others)

…e start/stop

Close channel after send
Close listener gracefully and raise error if something happened
Use for/select for stopping long-running goroutines gracefully

…d plugin registry

Check if the client is actually connected before closing it
Stop scheduler before clearing the jobs (safer)

…taking any action

The atomic bool will eliminate the need for empty read
Remove unnecessary select
Add deadline to kill the client connection immediately

Initialize context (_) and span inside the goroutine to prevent data races
Unify log and trace event message

Use a separate rwmutex for server code

…hods

Use a mutex to prevent data races to client.conn
Reset context to prevent early timeouts
Check for field value before logging it

Fix tests

Check if listener is not nil before closing it

Add new make target for finding race conditions in tests