Rework the RAFT project to be more incremental

[sre-is-laura]

It's a bit much as it stands.
I can see two ways to make it more reasonable

1. provide a starter with all the mechanics of rpcs etc defined, but some methods to be filled in
2. provide a full implementation but without the otel tracing element. include some bug or bugs that can be tracked down with tracing.

[sre-is-laura]

Planning to work on the idea 1 above in April. The to-be-implemented parts should reference which sections of the raft paper are necessary.

Project should advise students how to use the tracing to validate how their project is working as they go.

[sre-is-laura]

We should sequence the project a bit as well - e.g. do leader election first, then the k/v
I think experienced folks would do this but harder for newbies to make a plan of attack

also, see if we can add distributed trace to an earlier project eg tracing