High level plots - ability for per-column/series hover series names

[stringfellow]

It seems that the high-level plots are missing the ability to render the name of the series when hovering over it. This is incredibly useful for very high density data where simple colouring and legends may not be appropriate. For example, consider you have 100 lines or stacked areas on a chart, a legend is fairly useless.

Here's how I've solved this problem for a stacked area (with help from the folks on the Gitter), but given that I need to do the same for TimeSeries (it seems) etc, I feel this is an omission as an option for the high level charts.

https://gist.github.com/stringfellow/1f0a7ab327de326c805e23966fb975ec

[Maggie-M]

moved to bkcharts repo

[github-actions]

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