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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…

The task

When I call `exists, err := client.BatchExists(nil, []*Key{keyA, keyB, keyC})` and `keyA` and `keyC` exist while `keyB` does not, I should get `[]bool{true, false, true}` with a nil error. When I call it with two missing keys, I should get `[]bool{false, false}` with a nil error; a missing key is a per-key false…

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.