subset embedding UI improvement

[bkmartinjr]

This builds upon #1631 and #1658.

Improved UI for embeddings that include only a subset of all cells. Specifically:

• viewing such a subset embedding will automatically subset all other annotation summaries (eg, histograms)
• size of embedding is displayed in the embedding choice button, per resolution to UI design for handling embeddings which have a subset of all cells #1650

As part of doing this, the view stack semantics are also cleaned up and the code DRY'ed.

Fixes #1559
Fixes #1650

[codecov-commenter]

Codecov Report

Merging #1667 into main will increase coverage by 0.38%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #1667      +/-   ##
==========================================
+ Coverage   68.02%   68.40%   +0.38%     
==========================================
  Files         116      116              
  Lines       10072    10079       +7     
  Branches      463      462       -1     
==========================================
+ Hits         6851     6895      +44     
+ Misses       3159     3122      -37     
  Partials       62       62              

Flag	Coverage Δ
#frontend	71.76% <66.66%> (+0.32%)	⬆️
#javascript	71.76% <66.66%> (+0.32%)	⬆️
#unitTest	71.76% <66.66%> (+0.32%)	⬆️

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Impacted Files	Coverage Δ
client/src/annoMatrix/viewCreators.js	75.00% <50.00%> (-5.00%)	⬇️
client/src/annoMatrix/annoMatrix.js	67.32% <100.00%> (+0.32%)	⬆️
common/app_config.py	73.29% <0.00%> (+0.05%)	⬆️
server/common/app_config.py	73.29% <0.00%> (+0.05%)	⬆️
client/src/annoMatrix/loader.js	94.39% <0.00%> (+0.05%)	⬆️
client/src/util/stateManager/controlsHelpers.js	43.47% <0.00%> (+1.25%)	⬆️
data_anndata/anndata_adaptor.py	83.17% <0.00%> (+3.36%)	⬆️
server/data_anndata/anndata_adaptor.py	83.17% <0.00%> (+3.36%)	⬆️
client/src/annoMatrix/schema.js	77.77% <0.00%> (+3.49%)	⬆️
client/src/util/catLabelSort.js	94.73% <0.00%> (+5.26%)	⬆️
... and 2 more

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