Improve output for errors

[pihme]

Currently the output for errors looks somethings like this:

status: Unavailable, message: "Expected to execute command on partition 0, but either it does not exist, or the gateway is not yet aware of it", details: [8, 14, 18, 111, 69, 120, 112, 101, 99, 116, 101, 100, 32, 116, 111, 32, 101, 120, 101, 99, 117, 116, 101, 32, 99, 111, 109, 109, 97, 110, 100, 32, 111, 110, 32, 112, 97, 114, 116, 105, 116, 105, 111, 110, 32, 48, 44, 32, 98, 117, 116, 32, 101, 105, 116, 104, 101, 114, 32, 105, 116, 32, 100, 111, 101, 115, 32, 110, 111, 116, 32, 101, 120, 105, 115, 116, 44, 32, 111, 114, 32, 116, 104, 101, 32, 103, 97, 116, 101, 119, 97, 121, 32, 105, 115, 32, 110, 111, 116, 32, 121, 101, 116, 32, 97, 119, 97, 114, 101, 32, 111, 102, 32, 105, 116], metadata: MetadataMap { headers: {"content-type": "application/grpc"} }

Only status and message are helpful. Maybe metadata at some point if it helps troubleshooting connection and authentication errors.