Use logging.config and do not pass CLI args as a parameter

[amaslenn]

Summary

1. Use logging.config, always write DEBUG logs into debug file.
2. Use module-level logger object for better configurability on user end.
3. Use explicit arguments instead of argparse's args for high level function. It will simplify code re-use for users.

Test Plan

CI

Additional Notes

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[TaekyungHeo]

I can merge when you rebase. @srinivas212 confirmed.