Allow administrators to manage addresses for mailing list users

Summary: Ref T8387. Mostly just modernizes this panel to work for viewers vs users. Auto-verify these edits since they aren't otherwise verifiable.

Test Plan:

• Added, changed, removed addresses for a list.
• Used panel normally for my own account.
• Verified bots don't get a panel.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: eadler, epriestley

Maniphest Tasks: T8387

Differential Revision: https://secure.phabricator.com/D13125