[#291] get namespace endpoint

src/frostfs_testlib/storage/dataclasses/frostfs_services.py

@@ -39,6 +39,9 @@ class S3Gate(NodeBase):
     def get_endpoint(self) -> str:
         return self._get_attribute(ConfigAttributes.ENDPOINT_DATA_0)
 
+    def get_ns_endpoint(self, ns_name: str) -> str:
+        return self._get_attribute(f"{ConfigAttributes.ENDPOINT_DATA_0}_namespace").format(namespace=ns_name)
+
     def get_all_endpoints(self) -> list[str]:
         return [
             self._get_attribute(ConfigAttributes.ENDPOINT_DATA_0),