[mdx] Support more comment syntaxes

[pomber]

We only support // syntax for comment annotations. Maybe we could use vscode-textmate directly to find any comment content for any supported lang.

[Mayank-Sh07]

@pomber Why not have a globally supported comment annotation?

For example

// focus
inputOne = int(input())
inputTwo = int(input())

does not work with python, instead I'm required to detect and change the comment character to #. Supporting // or maybe some custom character across all languages would make it easier to separate out the codehike notations from the actual code when not relying completely on the metastring syntax.

[github-actions]

Released in v0.10.0-next.0 🚀

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