feat: Slack message show PR authors, approvers, etc.

[AndersDJohnson]

Is your feature request related to a problem? Please describe.
Not a problem, but would like if there were more attribution and acknowledgement of the hard work for the people involved in the changes that shipped!

Describe the solution you'd like
It would be cool if the Captain's Log Slack message showed the author of the PR alongside the title, etc.! And maybe even the reviewers/approvers of the PR too. Perhaps only if it can be derived from data we already can pull, and doesn't require additional calls to GitHub that might be too expensive? Maybe still in that case, if we have concerns, we could build it but make it opt-in or opt-out.

Describe alternatives you've considered
n/a

Additional context
n/a