Appflowy Codeblocks

[gnunicorn]

This brings code-block support to our internal appflowy editor.

• import plugin code base into our repo
• upgrade plugin code base to work with our latest appflowy version
• clean up design to make it more concise and take up less space (move overlayer into stack on the right side)
• fix expansion issue
  the editor isn't properly expanding when we insert a code block
• fix paste-into block issue
  it currently flows over the codeblock upon paste
• fix inline-enter issue
  on desktop you can't properly enter in the code unless because of our enter-to-submit trap around it (which should probably become smarter itself)

Superseeds #2691

[github-actions]

Hey there 👋,
and thanks for the contribution. But it seems like you forgot to

• 📰 Add a markdown file in .changes/ explaining what changed

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 43.75%. Comparing base (ec7bbe4) to head (f92a143).

Files with missing lines	Patch %	Lines
...pp/lib/common/widgets/html_editor/html_editor.dart	75.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3047      +/-   ##
==========================================
- Coverage   43.85%   43.75%   -0.10%     
==========================================
  Files         901      901              
  Lines       56658    56676      +18     
==========================================
- Hits        24847    24800      -47     
- Misses      31811    31876      +65     

Flag	Coverage Δ
integration-test	51.04% <ø> (-0.26%)	⬇️
unittest	33.68% <75.00%> (+<0.01%)	⬆️

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