Refactor Project to Support Kai RPC Client

[JonahSussman]

Tasks

Beta Give feedback

1. Strip down back end to only serve solved incidents
2. Set up repo structure to better accommodate RPC client
3. Write stub RPC client

Some of my thoughts:

I took a previous stab at this here, but we weren't ready to have this in: #352. The big idea was the directory structure for kai looked like:

kai/
├─ server/      # everything related to ONLY the server
├─ rpc_client/  # everything related to ONLY the rpc client
└─ shared/      # shared things, mainly pydantic models for communication and constnants