[FEA] Add Label_map for datashader plots

[taureandyernv]

Is your feature request related to a problem? Please describe.
I wish cuXfilter would let me label the values of Datashader plots with a different mapping, as it can with the Bokeh plots.

Example, if i have to use numeric 1 and 0, I'd like to be able to relabel them as True and False, Yes and No or Positive and Negative on the plot.

The only alternate is explicitly telling the reader to make the mapping in their mind in the notebook or as part of the title and show 1 and 0.

[AjayThorve]

Need further clarification on this, can you add a reproducible code. What datashader charts are you aiming for?

[github-actions]

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[github-actions]

This issue has been marked stale due to no recent activity in the past 30d. Please close this issue if no further response or action is needed. Otherwise, please respond with a comment indicating any updates or changes to the original issue and/or confirm this issue still needs to be addressed. This issue will be marked rotten if there is no activity in the next 60d.

[exactlyallan]

We do have label maps currently.