Added a Note Credential Type for Passphrase
Summary: Closes T8481.
Test Plan: Verify that in Passphrase > Create an option to create a Note credential exists and credentials of type Note are createable.
Reviewers: epriestley, #blessed_reviewers, eadler, lpriestley
Reviewed By: eadler
Subscribers: joshuaspence, epriestley, Korvin
Maniphest Tasks: T8481
Differential Revision: https://secure.phabricator.com/D13261