Add VRF Attribute to InterfaceByIP Function Output

The InterfaceByIP function in Network Intent currently returns interface information without any indication of VRF membership, even when the resolved interface belongs to a non-default VRF. This enhancement would extend the function's output object to include a VRF attribute alongside the existing interface data. Customers building automated remediation logic, such as setting a source interface for services like NTP, would be able to correctly account for VRF context without requiring a separate lookup step.