[WebSocket] Add support for sending binary data (ArrayBuffer) #6190
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Adding WebSocket support for sending ArrayBuffer. This was previously not implemented, just printing a warning to console.
Support for receiving ArrayBuffers was implemented in #4483.
Test plan
Code was tested with Paho MQTT Client that requires support for sending ArrayBuffers.
This test code roundtrips an MQTT message over websockets and writes to console:
CLA has been signed.