We require a page in distributed docs to outline how networking works

• What kind of servers do we have
• How do they speak to each others, e.g. what is a comm, what is a batchedcomm, what is a stream
• When and why do we pool comms and when is a comm long living
• What happens (or should happen) if a comm breaks (e.g. stream comm broken removes a worker while direct comms are usually retried/handled)
• When do we use what kind of comm?
• What kind of RPC protocol are we using?

This list is exhaustive. This issue can be used to refine what the content should look like