Catboost integration support

[bgalvao]

We are big fans of Catboost and would love to be able to track training with Catboost.

In the meantime, I am scratching my head as to how to log training metrics (iteration by iteration) manually... It does not seem to be possible afaik. 🤔

[shcheklein]

Please check this example https://dvc.org/doc/dvclive/how-it-works#example - it should be possible to do this manually. Give it a try and let us know if something doesn't work for you.