Add client connection time metrics

[lukasIO]

starting with a minimal set of timings and errors.
This is not considered completed, would value some feedback WRT what else we'll want to send.

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[toger5]

To understand this right, the connection times/durations will be sent through the websocket connection to the SFU. The SFU probably uses it to build the dashboard?
Is there a way to locally emit this data with js events from the livekit client?
So that one could use different ways to analyze/visualize this data? (for example posthog)

publisher?: number;, subscriber?: number; refers to the sending and receiving peer connection durations right?

[lebaudantoine]

This work seems super interesting to me, is it stale @lukasIO ?
(I am also using Posthog in my product)