feat: add shiki code block extension to the editor

[LIlGG]

What type of PR is this?

/kind feature

What this PR does / why we need it:

为默认编辑器代码块提供基于 Shiki 的高亮扩展。用于支持在默认编辑器中选择高亮及主题色的功能。

此功能需要 PR halo-dev/halo#6428 的支持。

How to test it?

测试安装插件之后，在默认编辑器中的代码块是否可以选择 Shiki 相关的高亮语言。

Does this PR introduce a user-facing change?

为默认编辑器添加基于 Shiki 的代码块扩展。

[f2c-ci-robot]

@LIlGG: The label(s) kind/feature cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

/kind feature

What this PR does / why we need it:

为默认编辑器代码块提供基于 Shiki 的高亮扩展。用于支持在默认编辑器中选择高亮及主题色的功能。

How to test it?

测试安装插件之后，在默认编辑器中的代码块是否可以选择 Shiki 相关的高亮语言。

Does this PR introduce a user-facing change?

为默认编辑器添加基于 Shiki 的代码块扩展。

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[f2c-ci-robot]

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[ruibaby]

我将合并此 PR，方便后续按实际反馈和修复问题。