Zanzana: periodic sync of team members (#94752)

* Rewrite zanzana collector to fetch all available pages

* Register access control as a background service

* If zanzana is enabled we run Syncs and start Reconciliation job

* Update pkg/services/authz/zanzana/client/client.go

Co-authored-by: Alexander Zobnin <alexanderzobnin@gmail.com>

* Use server lock when doing performing reconciliation

pkg/services/accesscontrol/mock/mock.go

@@ -90,6 +90,10 @@ func (m *Mock) GetRoleByName(ctx context.Context, orgID int64, roleName string)
 	return nil, nil
 }
 
+func (m *Mock) Run(ctx context.Context) error {
+	return nil
+}
+
 func (m *Mock) GetUsageStats(ctx context.Context) map[string]interface{} {
 	return make(map[string]interface{})
 }