Add more granular OAuth scopes (#7929)

* Add more granular OAuth scopes

* Add human-readable descriptions of the new scopes

* Ensure new scopes look good on the app UI

* Add tests

* Group scopes in screen and color-code dangerous ones

* Fix wrong extra scope

app/javascript/styles/mastodon/forms.scss

@@ -612,3 +612,7 @@ code {
     display: block;
   }
 }
+
+.scope-danger {
+  color: $warning-red;
+}