direct client websocket connection does not guarantee thread safety

[mariobassem]

had an issue with terraform while trying to concurrently write on the direct client websocket connection. after some investigation with @ashraffouda, we found that the websocket connection used by the direct client should not be used by more than one go routine concurrently to perform read operations, and no more than one go routine to perform write operations, this is mentioned here
i tried to wrap the write method with locks, and the issue disappeared.