Pass additional metadata for SIP

[dennwc]

Add metadata for SIP:

• Human-friendly name for SIP Trunks and Dispatch Rules.
• Custom user metadata for all SIP objects. Metadata set on Dispatch Rules will be inherited by SIP participant created by the rule.
• Add SIP Call ID, for better logging and tracing.
• Methods like EvaluateSIPDispatchRule will now return a Trunk and Dispatch Rule ID used.

There's one potentially breaking change: previously SIP participants had Phone prefix for both participant name and identity. Now identity will have a shorter sip_ prefix. Name will still be the same.

Since some users parse phone number from one of these, we need to notify them about the change and make sure they use name instead of identity. Future change will add cleaner way for getting SIP number for a participant.

[changeset-bot[bot]]

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Latest commit: e553b08f9403f0a54bd09b24b1bb12c9ace5c7ce

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