Add Cell tag-based style UI

[bollwyvl]

References

• fixes Add Tag-based Cell Style UI #39

Changes

• update env
• fix broken CI badges
• refactor non-structural, style-related aspects to design manager
• add (multi) cell slide type commands
• bump/test minimum python3.8, test on 3.11
• refactor design tools as composable widget
  • move existing tools into new design tools
  • add cell tag tool
  • add style template tool
• ???
• tests
• docs
• changelog

[codecov]

Codecov Report

Merging #40 (4d54d13) into main (dc0abf2) will decrease coverage by 3.66%.
The diff coverage is 88.93%.

❗ Current head 4d54d13 differs from pull request most recent head fb4d878. Consider uploading reports for the commit fb4d878 to get more accurate results

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
- Coverage   92.82%   89.16%   -3.66%     
==========================================
  Files          14       24      +10     
  Lines        1268     1514     +246     
  Branches      248      278      +30     
==========================================
+ Hits         1177     1350     +173     
- Misses         45      106      +61     
- Partials       46       58      +12     

Flag	Coverage Δ
back-end	100.00% <100.00%> (ø)
front-end	89.03% <88.83%> (-3.69%)	⬇️

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

Impacted Files	Coverage Δ
js/jupyterlab-deck/src/plugin.ts	100.00% <ø> (ø)
js/jupyterlab-deck/src/tools/layover.ts	95.34% <ø> (ø)
js/jupyterlab-deck/src/design.ts	69.38% <69.38%> (ø)
js/jupyterlab-deck/src/tools/base/button.ts	76.47% <76.47%> (ø)
js/jupyterlab-deck/src/tools/manager.ts	82.14% <82.14%> (ø)
js/jupyterlab-deck/src/tools/styleDefaults.ts	84.09% <84.09%> (ø)
js/jupyterlab-deck/src/tools/deckDefaults.ts	91.66% <91.66%> (ø)
js/jupyterlab-deck/src/notebook/plugin.ts	91.83% <91.83%> (ø)
js/jupyterlab-deck/src/tools/base/selector.ts	94.59% <94.59%> (ø)
js/jupyterlab-deck/src/tools/base/slider.ts	95.16% <95.16%> (ø)
... and 12 more

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[bollwyvl]

Should use this pattern to get updated selections: jupyterlab/jupyterlab#13915