etcd-io/etcd ? reverse-engineered prompt

Build me a reliable distributed key value store in Go that I can run locally or as a small cluster.

It should let me store and read simple keys and values from a command line client, and it should keep working even if one node goes down. I want a clean gRPC API, support for secure connections with TLS, and a setup that can run as a single node or a three node cluster for testing. Please include a basic command line tool to put and get values, plus a simple config file and examples for starting the server.

Make sure the data is replicated safely using a leader based consensus approach, and include a few tests so I can verify the cluster behavior and basic reliability. If you need current implementation details, look up the latest docs online.