feat: initialize and open source email plugin code

[kaymckay]

Adding Initial email code to external repo

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@9c2223f). Click here to learn what that means.
The diff coverage is n/a.

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[plyr4]

LGTM, nice work

[plyr4]

LGTM, appreciate the optional auth changes.

[GregoryDosh]

Correct me if I'm wrong, but I seem to recall someone like @wass3r mentioning that the way that the changelogs are done historically was causing some clashing (& thrashing with overwrites) with using built-in GitHub changelog creation. Do we need to make updates to the workflows to remove that old changelog action and functionality in favor of GitHub's built-in?

[GregoryDosh]

Left a couple of comments on some things, but overall thank you for creating this! Looks great.

[GregoryDosh]

Great work! Thanks for taking the time and effort to make this available for the community.

There were some small nits I included above but they're not show stoppers. I'll approve for now and if you need a re-approval later lemme know.