I want the Go client to support multi-key existence checks from an existing connected client with func…

I want the Go client to support multi-key existence checks from an existing connected client with func…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). When I call exists, err := client.BatchExists(nil, Key{keyA, keyB, keyC}) and keyA and keyC exist while keyB…