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fix: Replace Date.now() with performance.now() #298

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CptLemming
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When using WebsocketClientTransport I've noticed if a users local clock gets adjusted, a connection timeout is triggered:

No keep-alive acks for 30000 millis
WebsocketDuplexConnection: Socket closed unexpectedly

This is caused by keeping track of timeout with Date.now() which doesn't account for clock skew.

See https://developer.mozilla.org/en-US/docs/Web/API/Performance/now#performance.now_vs._date.now

performance.now() uses a monotonic clock, preventing clock skew
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