Test renderer messaging API

[connor4312]

Refs: #123601

• anyOS @isidorn
• anyOS @andreamah

Complexity 4

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Renderers do not use standard webview messaging, so we created a new messaging channel for them to talk to the extension. Messaging must be requested statically and is opt-in, since renderers which have a hard dependency on messaging will not be usable in aznb.

You can test this functionality with an existing renderer-bearing extension, like github-issues-notebooks, or create your own renderer via npm install -g generator-code && yo code --insiders

[isidorn]

Link to API to be reviewed: https://github.com/microsoft/vscode/blob/main/src/vs/vscode.proposed.d.ts#L1471
Link to github-issues-notebooks extension (which can be installed to try this out) https://github.com/microsoft/vscode-github-issue-notebooks

[isidorn]

I reviewed this API and used it very basically. I think it would be more useful if potential clients of the API also provide their real world feedback.

[andreamah]

I also tested it pretty basically in the github-issues-notebook extension, so I agree with the comment above that it would be helpful if potential users are to try it.