Allow apps to dynamically generate OAuth scopes

This replaces the settings merging for the static
`OAUTH2_PROVIDER["SCOPES"]` setting.

Attention: Breaking change, only release with next major version. Can
be backported to minor release if support for old mechanism is glued
into the new one, with a deprecation warning.

(cherry picked from commit 1aabacae)

aleksis/core/apps.py

@@ -138,12 +138,8 @@ class CoreConfig(AppConfig):
             # Save the associated person to pick up defaults
             user.person.save()
 
-<<<<<<< HEAD
     @classmethod
     def get_all_scopes(cls) -> dict[str, str]:
-=======
-    def get_all_scopes(self) -> dict[str, str]:
->>>>>>> 1aabacae (Allow apps to dynamically generate OAuth scopes)
         scopes = {
             "read": "Read anything the resource owner can read",
             "write": "Write anything the resource owner can write",