feat: moved print_rank_0 function towards a better fitting place

[fromm-m]

What does this PR do?

This PR moves the print_rank_0 function from a kind of legacy place towards a more central position.

General Changes

• ..

Breaking Changes

• ..

Checklist before submitting final PR

• [x] My PR is minimal and addresses one issue in isolation
• [x] I have merged the latest version of the target branch into this feature branch
• [x] I have reviewed my own code w.r.t. correct implementation, missing type hints, proper documentation, etc.
• [x] I have run a sample config for model training
• [x] I have checked that all tests run through (python tests/tests.py)