* Eliminate extra accounts select query from FollowService
* Optimistically update follow state in web UI and hide loading bar
Fix#6205
* Asynchronize NotifyService in FollowService
And fix failing test
* Skip Webfinger resolve routine when called from FollowService if possible
If an account is ActivityPub, then webfinger re-resolving is not necessary
when called from FollowService. Improve options of ResolveAccountService
Offload creation of local notifications to a worker. Remove two
redundant SQL queries from ProcessMentionsService, remove n+1
XML/JSON serialization via memoization
Eugen Rochko