feat: 🎸 add GroupManager::addAdmin for SPREGAPPLICATION

Allow SPREGAPPLICAITON role to add admins of groups. This allows the
application to set groups as self manageable.

Author: Dominik Frantisek Bucik

perun-base/src/main/resources/perun-roles.yml

@@ -8173,6 +8173,7 @@ perun_roles_management:
       - PERUNADMIN:
       - VOADMIN: Vo
       - GROUPADMIN: Group
+      - SPREGAPPLICATION:
     privileged_roles_to_read:
       - PERUNADMIN:
       - PERUNOBSERVER:
@@ -8181,6 +8182,7 @@ perun_roles_management:
       - GROUPADMIN: Group
       - GROUPOBSERVER: Group
       - GROUPMEMBERSHIPMANAGER: Group
+      - SPREGAPPLICATION:
     associated_read_roles:
       - GROUPOBSERVER
     assignable_to_attributes: true