Exposing the stream in the logging module

[jauy123]

The logging module should have an option to only stream to standard out/error rather than forcing a log file to disk.

In many HPC environments, the job controller capture both standard out and error to a text file. For many people, this is enough to debug their scripts if logging is redirected to those streams instead. Thus, logging to a file should be optional.

Describe the solution you'd like

Replace the logfile parameter in MDAnalysis.start_logging(logfile='MDAnalysis.log', version='2.1.0') with a stream parameter that acts like stream in logging.basicConfig

import logging
import sys

logging.basicConfig(
    level=logging.INFO,
    stream=sys.stdout,  
    format="%(asctime)s - %(levelname)s - %(message)s"
)

logging.info("This goes to stdout")
logging.error("This also goes to stdout")

Describe alternatives you've considered

You could wrap something elaborate with file steam redirection like in bash, but that is too complicated compared to this fix.

Additional context

[jauy123]

I don't mind working on this if the core devs are ok with this change.