Provide location for call creation process

[stroncoso-quobis]

Problem description
Current SIM-less calls can't implicit know the source of the call. SIM is not allocated on the device (RAN location is not possible) and IP location is not trustable (WiFi and other use-cases). Emergency calls and multiple other services require having access to the location of the originating device.

So it is an enhancement idea to include a location field on the call creation process.

Possible evolution
Include a dedicated object (locationDetails) on the session creation that includes the location object, a shared CAMARA common schema to define location of devices.

POST webrtc-call-handling/{apiVersion}/sessions
    ...
    locationDetails {
        shape,
        coordinates,
        method
        confidence,
        timestamp
    }
}

Alternative solution
No alternative solution provided

Additional context
Check for more details at @deepakjaiswal1 comment at https://lf-camaraproject.atlassian.net/wiki/spaces/CAM/pages/14549591/Emergency+Calling+in+WebRTC?focusedCommentId=23134224

This topic was widely discussed on WebRTC meeting group, check notes at Confluence.