T: macpdu2wireshark: dump to file instead of sending UDP packets

Cédric Rouxrequested to merge
macdpu2wireshark-big-traces into develop

In NR with several layers, we may have MAC PDU of size bigger than 64KB, which does not fit into a UDP buffer, destroying macpdu2wireshark.

Let's add an option to dump to a pcap file instead of using UDP packets. The DLT 252 magic is used (check wireshark documentation to understand). Run macpdu2wireshark with -h to see how to configure wireshark to read the produced files.

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