feat: improve CJK IME support

[LucasXu0]

Feature Preview

CJK IME preview

Windows

https://www.loom.com/share/60449cc32e1d4897a2b7e2f6e68e62b1

macOS

https://www.loom.com/share/292f65c1fd9240b389f881388b6bb871

closes #3227
closes #3193
closes #3173
closes #3155
closes #3132
closes #3060
closes #2896
closes #2909
closes #2769
closes #2768
closes #2666
closes #2331
closes #2222

---

PR Checklist

• My code adheres to the AppFlowy Style Guide
• 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

Merging #3278 (6a9f7d8) into main (255f305) will increase coverage by 56.17%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #3278       +/-   ##
===========================================
+ Coverage   12.61%   68.78%   +56.17%     
===========================================
  Files         468      468               
  Lines       21684    21697       +13     
===========================================
+ Hits         2735    14924    +12189     
+ Misses      18949     6773    -12176     

Flag	Coverage Δ
appflowy_flutter_integrateion_test	66.60% <ø> (?)
appflowy_flutter_unit_test	12.62% <ø> (+0.01%)	⬆️

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

see 364 files with indirect coverage changes