Add `highlight` to `kedro-viz` section of `dataset.metadata` to highlight it in the UI

[yury-fedotov]

Description

Add highlight to kedro-viz section of dataset.metadata to highlight it in the UI as a "key dataset" - e.g. with yellow background fill and black text.

Context

I'm regularly walking the team / audience through the kedro viz UI and almost always, on this huge DAG representation there are 2-3 datasets which are really the key artifacts I explain the flow in respect to.

Usually those are:

• Master table
• Trained model

Using modular pipelines, and hence leveraging the collapsing supernodes, is incredibly helpful is simplifying the DAG view and visually tracking where those key artifacts are. However, I though that since the metadata injection logic already exists in the kedro viz (e.g. adding layer to datasets), I thought that if the group decides that this feature is useful, it might be relatively easy to implement.

Possible Implementation

So the most elegant way I see is to do this exactly like e.g. layer can be added to a dataset in its catalog definition.

For example, let's say the trained_model is the one I want to highlight. See where I'm adding highlight: true:

# catalog.yml

trained_model:
  type: ...
  filepath ...
  metadata:
    kedro-viz:
      layer: models
      highlight: true

Possible Alternatives

Probably the above is the most natural place for this functionality to live, so not sure.

Checklist

• Include labels so that we can categorise your feature request

[astrojuanlu]

Thanks for opening this issue @yuryfedotov-mck !

@rashidakanchwala @NeroOkwa I think this is somewhat related to #1148, adds support for my idea of having a metadata.kedro-viz.style key (or even... support custom CSS????)