[Enhancement] Add support for SPDM

[hac-v]

SPDM is a standard by DMTF that enables "authentication, attestation and key exchange to assist in providing infrastructure security enablement".

I am currently doing research on SPDM and I was tasked with creating a fuzzer for the protocol. I recently learned about Scapy and think it will be easier to implement the specification using Scapy's library. I think Scapy can benefit from the implementation and have the specification in the repository.

Please inform me if anyone is working on this already. If not, I will further study how to do it. If anyone has any hints / tips I highly appreciate it.