R1:e0a3e6ba3b87

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.