Add metabase and write_cache operations

Signed-off-by: Andrey Berezin <a.berezin@yadro.com>

src/frostfs_testlib/storage/dataclasses/frostfs_services.py

@@ -177,6 +177,12 @@ class StorageNode(NodeBase):
     def delete_pilorama(self):
         self.host.delete_pilorama(self.name)
 
+    def delete_metabase(self):
+        self.host.delete_metabase(self.name)
+
+    def delete_write_cache(self):
+        self.host.delete_write_cache(self.name)
+
     @property
     def label(self) -> str:
         return f"{self.name}: {self.get_rpc_endpoint()}"