feat(livekit): add sip invite message to sip participant attributes

[mohsenbostan]

This adds sip invite message to SIP participant attributes

(a PR will be opened for the changes from the SIP side)

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Latest commit: 955fb84

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[dennwc]

Full INVITE message could be pretty large and may be larger than LiveKit's attribute size limit.

What's the exact information you want to extract from the INVITE?