add cell_ids to widget, fix selection model

[bollwyvl]

References

• fixes #85

Changes

• [x] uses getCellsById correctly (was passing a single string, which was interpreted as a list)
• [x] adds robot test of multiple cells
• [x] adds cell_ids trait
• [x] update changelog
• [x] simple widget example notebook to use cell_ids rather than string parsing
• [x] update jupyterlite
• [x] add some notebooks to demo

[codecov[bot]]

Codecov Report

Merging #88 (89a9f8e) into master (7e38b4c) will increase coverage by 0.12%. The diff coverage is 96.55%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
+ Coverage   96.48%   96.61%   +0.12%     
==========================================
  Files          25       25              
  Lines         711      767      +56     
  Branches       78       87       +9     
==========================================
+ Hits          686      741      +55     
- Misses         13       14       +1     
  Partials       12       12              

Impacted Files	Coverage Δ
.../ipydrawio-export/src/ipydrawio_export/__init__.py	100.00% <ø> (ø)
.../ipydrawio-export/src/ipydrawio_export/_version.py	100.00% <ø> (ø)
...kages/ipydrawio-export/src/ipydrawio_export/app.py	100.00% <ø> (ø)
...ipydrawio-export/src/ipydrawio_export/constants.py	100.00% <ø> (ø)
.../ipydrawio-export/src/ipydrawio_export/handlers.py	100.00% <ø> (ø)
...s/ipydrawio-export/src/ipydrawio_export/manager.py	91.34% <ø> (ø)
...wio-export/src/ipydrawio_export/serverextension.py	100.00% <ø> (ø)
...awio-export/src/ipydrawio_export/tests/conftest.py	100.00% <ø> (ø)
...awio-export/src/ipydrawio_export/tests/test_app.py	100.00% <ø> (ø)
...awio-export/src/ipydrawio_export/tests/test_cli.py	100.00% <ø> (ø)
... and 15 more

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