This commit refactors the EnvelopeAddress types(!) so that the brains
of them are centralized in the rfc5321 crate, removes the one from
the log-types crate, and replaces the internals of the one in the
message crate with the rfc5321 implementation.
This revised implementation accommodates quoted local parts more
consistently and exposes the local part via a normalizing accessor which
is in turn used when comparing addresses for equality.
This means that `"foo"@` and `foo@` now compare the same, and if you
have setup a maildir that generates per-user maildirs, we'll use the
normalized form of the local part rather than whatever is on the
incoming address.
Another side effect of this commit is that we can now accept exotic
quoted addresses like `"info@"@example.com` without falsely complaining
about having too many `@` signs in the address.
closes: https://github.com/KumoCorp/kumomta/issues/495
Wez Furlong