feature (events): Classify auth method request/resp messages for audit events. (#1640)

* refactor (oidc): Stop emitting error for not found token id

Stop emitting errors when authtoken repo.IssueAuthToken is called and
there's if no pending token.  It's not an "normal" state and not
an error condition.

* feature (audit tagging): Add tags for auth method requests/responses

Including testing functions for asserting audit events created
when a service is called

CONTRIBUTING.md

@@ -183,3 +183,4 @@ Note that if `max_connections` is set too low, it may result in sporadic test
 failures if a connection cannot be established. In this case, reduce the number
 of concurrent tests via `GOMAXPROCS` or selectively run tests.
 
+## [Adding additional field to an existing API (or new API)](internal/adding-a-new-field-readme.md)