key non-extended-key doesn't support extended CC keys

[smelc]

From @disassembler here on Slack:

trying to get the non-extended vkey fails:

{
   "type": "ConstitutionalCommitteeColdExtendedVerificationKey_ed25519_bip32",
   "description": "",
   "cborHex": "5840ccc861e906b7583b32490f7681c158a5ae9ae62dd6f902d94b4e7853113aebeb8a88a06f41eac7856c69f3b36d3e487f8535887e35f7fcfbd47a1f3bcef16eb8"
}

cardano-cli key non-extended-key --extended-verification-key-file /tmp/ext --verification-key-file /dev/stdout
Command failed: key non-extended-key  Error: Invalid key.

Interestingly drep works just fine, it's when I get to the cc_cold that it fails.

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Start of the solution here!? https://github.com/IntersectMBO/cardano-cli/compare/sl/cc-vkey-support