Add a web socket call concept for connecting. #1182
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Similar to HTTP and Call, the WebSocketCall is a representation of a pending HTTP request and subsequent upgrade to speak web sockets. Upon synchronous execution you are handed a WebSocket instance for synchronous writing and also pass in a WebSocketListener for async callbacks due to reading.
The API changes in this commits also generalize WebSocket such that it's agnostic to being a client or server peer.
Not implemented yet is an async version of the initial HTTP request (enqueue).
Closes #1173. Refs #193.