Standardize printing of MessageTransforms (#2308)

* Standardize printing of MessageTransforms

* Fix pre-commit black failure

* Add test for transform_messages printing

* Return str instead of printing

* Rename to_print_stats to verbose

* Cleanup

* t i# This is a combination of 3 commits.

Update requirements

* Remove lazy-fixture

* Avoid calling apply_transform in two code paths

* Format

* Replace stats with logs

* Handle no content messages in TokenLimiter get_logs()

* Move tests from test_transform_messages to test_transforms

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Co-authored-by: Wael Karkoub <wael.karkoub96@gmail.com>