Pass request messages across transport layer

[realityforge]

The first step is to rework the request system so that all of the inputs/outputs are explicit.

Inputs include:

• SessionID
• RequestID
• Job Name/Service+method name
• Job Parameters

Outputs include:

• Request Complete Flag
• Job Return value

Make sure this transports across the WebSocket transport.

The description from the equivalent rose issue:

Essentially replicant should be able to send json requests back and forth and receive a response back from the server. The request will just take a requestId and a json object. The server will be responsible for adding a handler to get the json blob and then optionally sending a response back as either an ok message or a specialized response message that contains the response json object.