feat(e2ee): emit meeting event when srtp cipher is changed

[jor-row]

COMPLETES SPARK-783803

This pull request addresses

Based on the new event sent from internal-media-core which was added in https://sqbu-github.cisco.com/WebExSquared/webrtc-media-core/pull/365 , grab the srtpCipher from the transport stat and forward that on in an event called MEETING_SRTP_CIPHER_UPDATED. This new event will be listened to in Cantina to update redux. The cipher could theoretically change in the middle of a meeting, which is why the event bus was used.

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[chrisadubois]

Only thing I'd say is we might want to add a readonly getter for the srtp cipher value, else lgtm

[github-actions]

🎉 Your changes are now available!
Released in: v3.12.0-next.54
📖 View full changelog →

Packages Updated	Version
webex	3.12.0-next.54
@webex/plugin-meetings	3.12.0-next.42

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