Starter code for raft-otel project

[lauranooooo]

This is based on Eli Bendersky's [https://eli.thegreenplace.net] RAFT demo code.
It is intended to be a good jumping off point for the raft-otel project.
Intentionally some todos left in here that will be referenced in the project writeup.

It does not solve the whole project - it doesn't do distributed tracing or any of the other extensions.

I've modified it in a few ways:

• Adds a main.go so you can run the RAFT code as docker containers (or Kube) - peers are found via DNS lookup
• Changed from integer based peer IDs to use of IP addresses, so that the instances can come up without coordination with each other
• Changed from standard RPC to gRPC (as we've been using throughout this course)
• Adds Dockerfile and docker-compose.yml
• Added structure to Command (to simplify gRPCing)
• Removed one test (TestCrashAfterSubmit) as could not make the timing work to reliably crash leader before it had a chance to commit a change (would be easier to do this if code were restructured to inject time)
• Added endpoint for doing some sets/gets of data, and a simple client that calls this - to demo what's usually done with RAFT, also added a client that exercises it

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