1. If the user wants authenticate the request, then user needs to do
this before upgrading the protocol to websocket.
2. To achieve this, added pre_handshake_callack, which will execute
before handshake, i.e. before switching protocol.
Now the uri handler gets called immediately after the handshake. In the handler we can identify that this was the handshake by checking req->method as it is still a GET from the first part of the handshake the client has sent. On a normal websocket-frame-receive (when normally a websocket uriHandler gets called) this field is set to 0
Closes https://github.com/espressif/esp-idf/issues/6597