feat: move continuous fields to the dataset drawer if there is a single value for all cells

[seve]

#615

Adds redux state and handling logic in histogram component to remove fields if the anno matrix is not a view and the field contains a single value for all obs.

To test:

copy the test dataset to example-dataset/:

AWS_PROFILE=single-cell-prod aws s3 cp --recursive s3://hosted-cellxgene-prod/67a79be6-e85f-471b-82cf-1d773f61f8f2.cxg ./singleton.cxg/

navigate to the dataset

you should not see donor_BMI_at_collection in the LSB, but rather the dataset drawer

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.27%. Comparing base (0d204de) to head (04b7577).
Report is 38 commits behind head on main.

❗ Current head 04b7577 differs from pull request most recent head 4d876b3. Consider uploading reports for the commit 4d876b3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #918      +/-   ##
==========================================
- Coverage   77.47%   77.27%   -0.21%     
==========================================
  Files          88       90       +2     
  Lines        6856     7024     +168     
==========================================
+ Hits         5312     5428     +116     
- Misses       1544     1596      +52     

Flag	Coverage Δ
frontend	77.27% <ø> (-0.21%)	⬇️
javascript	77.27% <ø> (-0.21%)	⬇️
smokeTest	?
unitTest	77.27% <ø> (-0.21%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[atarashansky]

How much work would it be to add a test for this? Could we write a singleton continuous field to the obs metadata for pbcm3k.cxg?

[seve]

#872

[tihuan]

Code looks good to me, but please wait for Alec's review on business logics, since I feel that I don't have enough context to form an opinion there 😆 🙏

Thank you!