MlflowLogger update

[y-ksenia]

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Description

Added log_artifact and updated close_log for MlflowLogger.

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Type of Change

• Examples / docs / tutorials / contributors update
• Bug fix (non-breaking change which fixes an issue)
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[Scitator]

🤔

[Scitator]

could you please add ScopeEnum with available alternatives for scope selection?
something like https://github.com/catalyst-team/catalyst/blob/master/catalyst/contrib/utils/thresholds.py#L12

[Scitator]

❓ and why do we need different scope support here?

[y-ksenia]

MlflowLogger has an option of nested runs.
So parent run is an experiment; child runs - stages. So to close some runs we need to close child runs on stage end and parent run on an experiment end.