Meta: use this extension outside VSCode

[danieldreier]

This is a thematic tracking issue to describe the broader set of requests around using this extension outside of VSCode, for example in Theia. The purpose of this issue is to consolidate tracking of those requests; work will need to be planned more concretely before implementation starts.

[danieldreier]

#379 is an instance of this

[radeksimko]

Addressed as part of #1064

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
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