add log_comment to allowedParams

[profick]

Description

https://github.com/ContentSquare/chproxy/issues/431

Pull request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [x] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

Checklist

• [ ] Linter passes correctly
• [x] Add tests which fail without the change (if possible)
• [x] All tests passing
• [x] Extended the README / documentation, if necessary

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Further comments