LK CLI is too verbose, add ability to set log-level

[chenosaurus]

by default, the cli is outputting logs at the INFO level, this can be very verbose, especially when there are data packets being published in a room. Add a log-level option to the CLI to allow user to explicitly set the log-level they need.

[rektdeckard]

@chenosaurus are you referring to the output when running lk perf load-test and similar, or did you intend to post this issue on the agents repo?

To be fair, the LK CLI should have more options when it comes to verbosity, but the log level doesn't really apply here.

[chenosaurus]

@rektdeckard when running a lk server and there are clients publishing messages over data channel, every message sent is printed to the terminal. For an application that's sending a lot of data it floods the terminal with INFO messages.