Add column for storing visualization embeddings

[ajtritt]

Motivation

It would be convenient to be able to store 2D or 3D embeddings meant for visualization alongside other AI outputs

How to test the behavior?

rt = ResultsTable(name="foo", description="a test results table")
rt.add_viz_embedding([[1.1, 2.9], [1.2, 2.8], [1.3, 2.7], [1.4, 2.6], [1.5, 2.5]])

Checklist

• Did you update CHANGELOG.md with your changes?
• Does the PR clearly describe the problem and the solution?
• Have you reviewed our Contributing Guide?
• Does the PR use "Fix #XXX" notation to tell GitHub to close the relevant issue numbered XXX when the PR is merged?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.23%. Comparing base (b5923f7) to head (d2556d1).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   82.87%   82.23%   -0.64%     
==========================================
  Files           2        2              
  Lines         146      152       +6     
  Branches       32       33       +1     
==========================================
+ Hits          121      125       +4     
- Misses         20       22       +2     
  Partials        5        5              

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[rly]

Looks good to me