[Feature Anywhere] Framework for plugin registration

[joshuarrrr]

Construct a framework allowing plugins to register an option on the visualization details panel, to let users maintain relationships between a visualization and their plugin resources

[jackiehanyang]

The registration workflow is done at the plugin level, with a change in Dashboards to improve context menu grouping method.

The PR for improving context menu grouping method - #3169

A screenshot of how the registration looks like on the visualization details panel

[jackiehanyang]

Will close the issue once the PR at Dashboards side has been merged. @joshuarrrr

[joshuarrrr]

@jackiehanyang @sikhote Is this closable now that we merged #3924?

[sikhote]

Possibly, I am still working on that enhancement we talked about yesterday, which is along the same lines, but allowing Alerts & Anomalies to be grouped next to each other without the separator (to make them appear related).

I will defer to @lezzago or others to make the call, if we want to wait for that change before closing this.