enhance(frontend): コード入力ボックスをMkCodeEditorに変更

[kakkokari-gtyih]

What

• コード入力の部分をMkCodeEditorに変更し、シンタックスハイライトが効くようにした
• MkCodeEditorにMkTextareaと同様の機能を実装
• MkCodeEditorの入力がズレる問題を修正

Why

#9856 #12671

Additional info (optional)

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3e256ee) 79.68% compared to head (726d56c) 79.66%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #12682      +/-   ##
===========================================
- Coverage    79.68%   79.66%   -0.02%     
===========================================
  Files          960      959       -1     
  Lines       108573   108509      -64     
  Branches      8351     8350       -1     
===========================================
- Hits         86513    86449      -64     
  Misses       22060    22060              

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[syuilo]

👍