RFE: lab mr reply --quote-code

[prarit]

I've previously implemented the display of code comments similar to how the GitLab WebUI displays them. I'd like to add an additional option to make replying to code comments a bit easier by also adding the diff of the code comment. I don't know how useful that would be but I know I would use it a lot.

However, this turns us away from only mimicking GitLab's WebUI behaviour. Using the reply field there never allows you to add the code diff UNLESS you cut-and-paste it in. I suppose, however, it's not that far off because I'm just skipping the copy-and-paste step.

Thoughts? Counter-thoughts? Better idea?