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threadshare: udp: add property multicast-iface

Taruntej Kanakamalla requested to merge tkanakamalla/gst-plugins-rs:ts-udpsrc-fixes into main

Similar to the non threadshare counterparts, the ts-udpsink can accept only one multicast interface and the ts-udpsrc can accept a list of interfaces to be listening on for the multicast.

Use the getifaddrs crate to get the available network interfaces and filter the desired interfaces from the available interfaces

Reuse a custom api written for PTP helper to join and leave multicast group for IPv4 based addresses. Continue to use the UdpSocket crate's _multicast_v6 to join/leave an IPv6 multicast group

Edited by Taruntej Kanakamalla

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