Feature request: allow unit selection based on categorical property

[alejoe91]

It would be nice to be able to filter the Units views based on categorical values.

Our use case at the Allen is that we want to export all spike sorted units with a column called default_qc that includes whether a unit passes our default set of quality metrics or not.
We would like to be able to use the PSTH and Tuning Curves view and select only the units that have default_qc=True.

I'd be happy to work on this! But I wanted to discuss with the team first :)

[CodyCBakerPhD]

This would be great to go with some of the IBL data as well, they have many unit properties and one of them is label, defined as the proportion of some number of quality metrics that 'pass' (are within acceptable ranges)

So pretty similar in terms of wanting to limit visualizations to only the 'best' of those units