An alternative to notmuch-address. This implementation is much
simpler. It gives up on persistent caching, external scripts and
backward compatibility.
This implementation uses the improved completion API offered by
Emacs 27.1 and later. notmuch-address uses that old API, which
Emacs still supports, but has issues.
To use notmuch-addr you must enable its use right after Notmuch
has loaded the old notmuch-address, which cannot be prevented.
If you do it later then it might have no effect:
(with-eval-after-load 'notmuch-address
(notmuch-addr-setup))
