Allow coloring embeddings plots by list fields

[brimoor]

Allows embeddings plots to be colored by list fields, eg sample or label tags.

This is useful, for example, in situations where each sample contains only one tag. IE train/test/val split. If there are multiple tags, the first one is used.

import fiftyone as fo
import fiftyone.brain as fob
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")
dataset.untag_samples("validation")

fob.compute_visualization(dataset, brain_key="img_sim")
fob.compute_visualization(dataset, patches_field="ground_truth", brain_key="gt_sim")

for tag in "abcd":
    dataset.take(100).tag_samples(tag)
    dataset.take(100).tag_labels(tag, label_fields="ground_truth")

session = fo.launch_app(dataset)

color-by-lists.mov

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c0e9610) 15.15% compared to head (089e3fc) 15.15%.

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v0.21.1    #3230   +/-   ##
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  Coverage            15.15%   15.15%           
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  Files                  563      563           
  Lines                68971    68971           
  Branches               600      600           
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  Hits                 10455    10455           
  Misses               58516    58516           

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[lanzhenw]

LGTM

[manivoxel51]

cool! 🍨