[Feature request] Support importing code snippets in code block import

[Mister-Hope]

Clear and concise description of the problem

See https://ecosystem.vuejs.press/plugins/markdown/markdown-include.html#syntax

Suggested solution

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Also I am considering moving this feature to ecosystem, as currently there are actually some problems with shiki highlighter.

[github-actions]

This issue is marked as stale because it has not had recent activity. Issues marked with stale will be closed if they have no activity within 7 days.

[github-actions]

This issue is marked as stale because it has not had recent activity. Issues marked with stale will be closed if they have no activity within 7 days.