PLT-6763 Implement user access tokens and new roles (server-side) (#6972)

* Implement user access tokens and new roles

* Update config.json

* Add public post permission to apiv3

* Remove old comment

* Fix model unit test

* Updates to store per feedback

* Updates per feedback from CS

store/sql_store.go

@@ -80,4 +80,5 @@ type SqlStore interface {
 	FileInfo() FileInfoStore
 	Reaction() ReactionStore
 	Job() JobStore
+	UserAccessToken() UserAccessTokenStore
 }