Add metadata parameters to kedro-mlflow datasets

[gtauzin]

Hi,
First of all, thanks a lot for this amazing plugin!

Description

It seems that kedro assumes its datasets can all take a metadata parameters. In previous versions of the kedro doc, I remember reading that metadata was meant to be exploited by orchestration-related kedro plugins, I could not find this statement anymore on the latest doc.

However, there is now a hook documented that aims at showing how to access metadata: https://docs.kedro.org/en/stable/hooks/common_use_cases.html#use-hooks-to-read-metadata-from-datacatalog

Context

I am developing a kedro plugin for the dagster orchestrator: https://github.com/gtauzin/kedro-dagster and I would like to be able to associate metadata to kedro-mlflow datasets. I make use of the metadata arguments of datasets to display a description or other metadata on the Dagster UI.

[gtauzin]

BTW, if this is as straightforward as it seems, I am happy to open a PR :)

[Galileo-Galilei]

Hi Guillaume, I'd love to have this, feel free to open PRs!

Btw I think it should already be ok for MLflowArtifactDataset because it fakes inheritance and preserves attributes of the underlying dataset.

[gtauzin]

Perfect @Galileo-Galilei, I will get started very soon!