Github action for notifiying of missing email in AUTHOR file

[jaytaph]

Does the following:

• fetches the first 10 committers in the diff and checks if either their name or email (or both) are found in the AUTHORS file.
• if not, it will post a comment saying the user is invited to add their name(s).
• if found (during a new commit after the first one), and the names are found, the comment is automatically removed.

[Sharktheone]

LGTM

[Sharktheone]

It might make sense to rename this PR

[jaytaph]

don't worry.. just testing some things out on github actions... always trail and error... will ping when this is finalized (and rebased)

[Sharktheone]

I guess, change it so, that it doesn't post multiple times. Besides that looks good.

[Sharktheone]

Not sure, how we want to handle this, but for example my name isn't in my commits nor on my GH Profile. When the person decides, to not have their email but the real name in the AUTHORS file, we can't know who it is. I guess, this is an edge case we need to manually Prevent. Maybe it is possible then to write the gh name in the <>s.

[emwalker]

Small suggestions. LGTM.