Inspector V2 Logic Spec

What logic do we need?

At startup
- Application initialization
- Handshake with proxy
- Processing config from proxy
Lazily
- Handshake with server
- Responding to server requests
- Responding to server notifications
- Responding to user input
- Responding to plugin input

docs(spec): Add logic implementation spec

This is being worked on with #1027 which will be put on a v1.5 branch for testing to see if it will be adequate base for v2.x.

This was addressed by #1027