Allow users to track plots for Experiment Tracking

[merelcht]

Description

Both in design research and a recent demo we've received feedback from users that they'd like to be able to log plots and see them as part of their experiments.

“Is there a plan for storing plots? Something we often like to see with metrics is a SHAP plot to see what relationship is learned."

@AntonyMilneQB says:

I spoke to Lim about this a long time ago and made some notes on his thoughts. He thinks we should have a dataset called something like tracking.ArtifactDataSet which is basically for everything that's not a metric or json. kedro-viz would then work out how to render the dataset dependent on the file type (e.g. png).
I (Antony) am not sure how this fits in with our existing matplotlib and plotly datasets. Especially because plotly dataset saves to json, how would kedro-viz know to render that as a plot? Do we need another type tracking.PlotlyDataSet to handle this case?

[yetudada]

Closed in favour of #1626