add CLI logging level option

[yarikoptic]

ATM dandidav is very talkative. I would not be surprised if that somehow also affects performance (ref #54) since it is processing lots of requests in parallel and screen is very busy with logs. Would be great to be able to reduce logging level to WARNING or alike.

"Current" options

shub@falkor:~/dandidav-test$ ./dandidav --help
WebDAV view to DANDI Archive

See <https://github.com/dandi/dandidav> for more information.

Usage: dandidav [OPTIONS]

Options:
      --api-url <URL>
          API URL of the DANDI Archive instance to serve
          
          [default: https://api.dandiarchive.org/api]

      --ip-addr <IP_ADDR>
          IP address to listen on
          
          [default: 127.0.0.1]

  -p, --port <PORT>
          Port to listen on
          
          [default: 8080]

  -T, --title <TITLE>
          Site name to include in HTML page titles
          
          [default: dandidav]

  -h, --help
          Print help (see a summary with '-h')

  -V, --version
          Print version
shub@falkor:~/dandidav-test$ ./dandidav --version
dandidav 0.1.0 (commit: c2195f4)

[jwodder]

@yarikoptic If you're still using commit c2195f4, you don't have the updates from #58, which drastically reduced the amount of stuff logged. Try updating and then see how you like the logs.

[jwodder]

@yarikoptic Do you still feel the logs are too much, or can I close this issue?

[yarikoptic]

Let's close for now -- I don't think I was burdened with them recently