FIX: Allow to set SSS debug logging verbosity

Summary

For https://gitlab.indiscale.com/caosdb/customers/f-fit/management/-/issues/43. Introduces separate parameter to control sss debug log verbosity and decrease verbosity to errors only by default.

Focus

Is the new default reasonable. Do we want sss_max_log_level=logging.DEBUG (i.e., old behavior) to not have a breaking change?

Test Environment

1. Run any SSS crawler with debug=False and verify that no DEBUG output is in the debuglog file.
2. Re-run with debug=True to check that the debuglog has its old verbosity.
3. Run with debug=False and sss_max_log_level=logging.DEBUG to verify that it restores the previous behavior.

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