Add WebRTC media stats collector

[EnricoSchw]

Checklist

• Tests written for new code (and old code if feasible)
• Linter and other CI checks pass
• Sign-off given on the changes (see CONTRIBUTING.md)

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This change is marked as an internal change (Task), so will not be included in the changelog.

[germain-gg]

Clearing the review request as this is still a draft.

[dbkr]

Some minor comments but this looks like a good approach. Thanks!

[dbkr]

Thanks, looks good. Do we want to keep the stats logging to the console for now? If so, I'd change that to use the logger wrapper. Otherwise looks great!

[EnricoSchw]

Thanks, looks good. Do we want to keep the stats logging to the console for now? If so, I'd change that to use the logger wrapper. Otherwise looks great!

@dbkr
The console log is only for debugging and to be able to see the structure of the metrics. I turned off the metric logs for now. I'm currently thinking about two options:

1. Broadcast metrics data events from SDK to ElementCall like you did it with device msg Events. So in EC we can decide how to display metrics (OTEL, Console, Posthog, Html-View )

• You would prefer this option?

2. Make it configurable via MatrxClient, how to display or where we send the metrics

• You would prefer this option?

(I prefer the first option, but with the option to disable the metrics as well)

The next steps for the metrics are:
-- Augment logs with feed data
-- Include pkg send/receive metric data for feed -tracks.
-- Add transceiver data in feed metrics

[dbkr]

I vote option 1 personally. I think the opentelemetry stuff will probably move in to the js-sdk in the long run, but we can get it out into EC with an event in the same way, that sounds ideal for now.