Seperate ipydrawio-widgets package for kernel-only installs

[bollwyvl]

References

• first step for Reduce size of installed packages, initial load impact #63
  • this brings the size of the in-kernel package down to ~22K 🎉

Changes

• bump jupyterlite to 0.1.0a20
• bump drawio to 16.4.0
• create new `ipydrawio-widgets' package
• move widgets and schema and widgets dependency there
• make ipydrawio depend on ipydrawio-widgets
• update docs
• update tests
• update changelog

[codecov]

Codecov Report

Merging #89 (3dfd457) into master (8b44965) will increase coverage by 0.50%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #89      +/-   ##
==========================================
+ Coverage   96.61%   97.11%   +0.50%     
==========================================
  Files          25       21       -4     
  Lines         767      729      -38     
  Branches       87       91       +4     
==========================================
- Hits          741      708      -33     
+ Misses         14       12       -2     
+ Partials       12        9       -3     

Impacted Files	Coverage Δ
py_packages/ipydrawio/src/ipydrawio/constants.py	100.00% <ø> (ø)
py_packages/ipydrawio/src/ipydrawio/__init__.py	100.00% <100.00%> (ø)
py_packages/ipydrawio/src/ipydrawio/clean.py	98.92% <100.00%> (+5.59%)	⬆️
...packages/ipydrawio/src/ipydrawio/tests/conftest.py	100.00% <100.00%> (ø)
...packages/ipydrawio/src/ipydrawio/tests/test_cli.py	100.00% <100.00%> (ø)
.../ipydrawio-widgets/src/ipydrawio_widgets/schema.py
...widgets/src/ipydrawio_widgets/tests/test_schema.py
...idgets/src/ipydrawio_widgets/tests/test_widgets.py

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