Adrian Zuber

Adds [MLflow](https://mlflow.org/) to resources.

`ConvergenceWarning` displayed in Ask-and-Tell Interface tutorial

2

### What is an issue? The warning in [this](https://optuna.readthedocs.io/en/stable/tutorial/20_recipes/009_ask_and_tell.html#apply-optuna-to-an-existing-optimization-problem-with-minimum-modifications) section can be muted as it's not related. 

No input sanitization in `enqueue_trial`

4

### Expected behavior While working on #3629 I found that passing param value of different type than suggested in objective function to `enqueue_trial` causes undefined behavior, depending on type of...

We want to make sure releases of dependencies do not cause any regressions.