feat: support toggle heading

[qinluhe]

Feature Preview

---

PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

[codecov]

Codecov Report

Attention: Patch coverage is 58.97436% with 48 lines in your changes missing coverage. Please review.

Project coverage is 65.09%. Comparing base (7ecf213) to head (f7eb8b2).
Report is 219 commits behind head on main.

Files with missing lines	Patch %	Lines
...p/src/application/slate-yjs/utils/yjsOperations.ts	33.87%	39 Missing and 2 partials ⚠️
..._app/src/application/slate-yjs/utils/applyToYjs.ts	42.85%	4 Missing ⚠️
...web_app/src/application/slate-yjs/command/index.ts	0.00%	1 Missing ⚠️
...ditor/components/blocks/toggle-list/ToggleList.tsx	90.90%	0 Missing and 1 partial ⚠️
...wy_web_app/src/components/editor/utils/markdown.ts	97.22%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6712      +/-   ##
==========================================
- Coverage   74.41%   65.09%   -9.32%     
==========================================
  Files         245      273      +28     
  Lines        6566    10572    +4006     
  Branches     1057     1446     +389     
==========================================
+ Hits         4886     6882    +1996     
- Misses       1628     3517    +1889     
- Partials       52      173     +121     

Flag	Coverage Δ
appflowy_web_app	65.09% <58.97%> (-9.32%)	⬇️

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