@shikijs/rehype: support langAlias options

[nomyfan]

Clear and concise description of the problem

createHighlighter supports langAlias. It would be nice if rehype supports it too.

Suggested solution

Add langAlias option for rehype plugin and pass down to createHighlighter

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

Contributes

• If this feature request is accepted, I am willing to submit a PR to fix this issue