Support for Gutters (custom data / visualization per-line)

[thejonathanbrown]

Context

• This issue is not a bug report. (please use a different template for reporting a bug)
• This issue is not a duplicate of an existing issue. (please use the search to find existing issues)

Description

I am evaluating if we can use Monaco as a replacement for the editor in our app and something that I haven't been able to determine the feasibility of is adding per-line data or custom visualizations. I attached an example of such a visualization below. Decorations aren't quite the right fit, but I'm wondering if there is a way to do this or not.

Other edits have this kind of option and it is very useful for customization, for example: https://codemirror.net/examples/gutter/

Thanks!

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