Init logging

One of the things we typically do in driver scripts is to setup the logging, e.g. ClimaAtmos has:
```julia
if ClimaComms.iamroot(comms_ctx)
Logging.global_logger(Logging.ConsoleLogger(stderr, Logging.Info))
else
Logging.global_logger(Logging.NullLogger())
end
```
Should we just fold this into `ClimaComms.init()`?

Start by reading ClimaComms.init() and the ClimaAtmos driver-script example shown in the issue. Decide whether initialization should configure different loggers for root and non-root processes, and document the expected behavior and tests needed before treating the change as complete.

Written by the indexing model from the issue text.