Add SipUaHelperListener onNewInfo callback

[eschmidbauer]

Add onNewInfo callback to SipUaHelperListener

Summary

• Surface SIP INFO events through the public SipUaHelperListener interface.
• Bridge internal EventNewInfo to a new SipInfo data object for consumers.

Why

• INFO messages are currently only accessible via internal event handling.
• Exposing a listener callback lets apps handle SIP INFO using the same public callback pattern as other SIP events.

Changes

• Register EventNewInfo in SIPUAHelper.buildCallOptions.
• Add _notifyInfoListeners to forward INFO events.
• Add SipInfo data holder and onNewInfo default method to SipUaHelperListener.

Testing

• Not added (API wiring only).

Notes

• Backwards compatible: existing listeners aren’t required to implement onNewInfo.