[Feature] Admin: sort user list by email (#12350)

### What problem does this PR solve?

Sort the user list by user email address.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

api/db/services/user_service.py

@@ -164,7 +164,7 @@ class UserService(CommonService):
     @classmethod
     @DB.connection_context()
     def get_all_users(cls):
-        users = cls.model.select()
+        users = cls.model.select().order_by(cls.model.email)
         return list(users)