Add `.go` (generic output) Pygments styling to code boxes?

[cmgoold]

One of the nice features of the original RTDs Sphinx theme is that generic prompts/generic outputs (i.e. .gp and .go pygment highlight classes, respectively) are recognised in code boxes. For instance, the following:

>>> [1, 2, 3]
    [1, 2, 3]

would show the console output in gray/another color, to indicate the output of an interactive Python session.

This is a minor change but useful for writing code examples in documentation. While users can just add some custom CSS for this, I wondered if it would make sense to add this directly? I find #bdbdbd plays nicely with the current colour schemes.

I'd be happy to add something like this, if it's of interest.