Add support for issue_comment on pull request

[shloimec2p]

It would be really useful for me if I could have access to the body of the message from the pull_request_review_comment, so I could use it on the Asana comment message.

[shloimec2p]

After reviewing, my goal is to add a comment on each PR comment, which is triggering the issue_comment event, I would like to get support for this event.

It's a little challenging as I don't see a way to get the PR details of an issue_comment even though it's using it when commenting on a PR