Replace print with logging in model training

[HallerPatrick]

Is your feature/enhancement request related to a problem? Please describe.

When using the ModelTrainer, everything is printed out through a logger, except for when the learning rate is reduced. This is just a normal print to stdout. See picture:

Describe the solution you'd like For consistency, I would replace the print call with a logging call. For this the logger has to be passed from the ModelTrainer to the AnnealOnPlateu object or just use the global flair logger.

If this is enough for a PR, then I would assign myself to this

Greetings, Patrick

[alanakbik]

@HallerPatrick this should be fixed in master branch -> https://github.com/flairNLP/flair/pull/2665

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