Add CBOR codec and BPv7 packet classes #4875
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…nitial BPv7 packets
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This change addresses #4874 by adding new base scapy classes to encode and decode CBOR structure RFC 8949. This is in support of a new protocol support for BPv7 RFC 9171. This work was adapted from earlier out-of-source additions from dtn-demo-agent.
Both include a minimal set of unit tests to cover normal behavior. Since this is focused on immediate needs for BPv7 the CBOR fields and packets are not exhaustive.
Fixes #4874