[agent] Report the accepted websocket subprotocol back through the WS shim. #141
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This PR adds a subprotocol field to the session message struct which is used at session creation time to report the websocket subprotocol (if any) that was accepted by the backend server.
The corresponding list of requested subprotocols from the client was already present in the forwarded request headers and is correctly forwarded to the backend; it's just the backend's response that was previously missing.