feat: add Dart syntax highlighting for the code blocks in the editor

[Sakura-LF]

添加代码块 dart 语言的高亮

What type of PR is this?

/kind feature
/area editor

What this PR does / why we need it:

为默认编辑器的代码块导入 dart 语言高亮

Which issue(s) this PR fixes:

Fixes #5530

Special notes for your reviewer:

Does this PR introduce a user-facing change?

编辑器的代码块支持选择 Dart 语言。

[CLAassistant]

All committers have signed the CLA.

[LIlGG]

hi, @Sakura-LF 感谢提交此 PR，不过这里有个问题需要解决一下。

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.56%. Comparing base (5fdf6c0) to head (10ec6b4).
Report is 69 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5531      +/-   ##
============================================
- Coverage     56.91%   56.56%   -0.35%     
+ Complexity     3319     3310       -9     
============================================
  Files           587      592       +5     
  Lines         18968    19178     +210     
  Branches       1401     1355      -46     
============================================
+ Hits          10795    10848      +53     
- Misses         7594     7769     +175     
+ Partials        579      561      -18     

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[ruibaby]

/lgtm

感谢贡献！

[JohnNiang]

Thanks for your first contribution!

/lgtm

[LIlGG]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang, LIlGG

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• ui/OWNERS [JohnNiang]

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