feat: Add `AuthMechanism::ScramSha3_512{,Plus}`

[coveralls]

Pull Request Test Coverage Report for Build 7916719754

Details

• -2 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.02%) to 92.944%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
imap-types/src/auth.rs	0	2	0.0%
<!--	Total:	0	2	0.0%	-->

Totals
Change from base Build 7916683331:	-0.02%
Covered Lines:	10103
Relevant Lines:	10870

---

💛 - Coveralls