Issues grouped by milestone

[birbilis]

Quoting from a discussion I had sometime ago at
cli/cli#6178 (reply in thread)

...
I suppose a grouping parameter would be useful for the list command

Issues grouped by milestone might be a good feature for the valeriobelli/gh-milestone extension. You could open a topic there and ask if this is something he also finds worthwhile.

I think I hadn't followed up on that with a feature suggestion in case it's of interest and if there's no other way to do it already