set root log level from zappa log_level #1347
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Description
Per ticket #1336, this P/R reverts part of PR #1277 to restore Zappa's prior functionality of setting the root log level.
PR #1277 (inadvertently?) broke cloudwatch logging for many users who use logging.info("") via Zappa's log_level = "INFO" or "DEBUG". Previously (before PR #1277 and 0.59.0), Zappa would set the root logger with Zappa's log_level. After 0.59.0, this functionality was removed via PR #1277.
This P/R restores the old log_level functionality, while still preserving the goal of PR #1277 to have separate loggers.
This P/R also adds unit tests to confirm logging is working as expected for the future. This P/R was tested locally on Python 3.8, 3.9, 3.10, 3.11, and 3.12, and in real AWS Lambda per the contributor guidelines.
GitHub Issues
See #1336