feat: add cose-key and cose-key-set codecs

Register the CBOR-native counterparts to pkix-pub/pkcs8-priv so the table has one-codec-per-role containers for both the DER (ASN.1) and CBOR (COSE) ecosystems, covering the same "algorithm identifier travels in the payload" model on both sides.

- cose-key (0x42): COSE_Key map per IETF RFC 9052 section 7; media type application/cose-key
- cose-key-set (0x43): COSE_KeySet array per IETF RFC 9052 section 7; media type application/cose-key-set
- split mirrors IETF's own registration of two media types and two CoAP Content-Format IDs (101 and 102), and keeps the "prefix tells you the shape" invariant
- both remain in the single-byte varint range (0x42 and 0x43 in the unclustered 0x39-0x4f block) for identifier cost parity with libp2p-key

Refs:
- https://www.rfc-editor.org/rfc/rfc9052
- https://www.iana.org/assignments/media-types/application/cose-key
- https://www.iana.org/assignments/media-types/application/cose-key-set

Author: lidel

table.csv

@@ -38,6 +38,8 @@ dns6,                           multiaddr,      0x37,           permanent,
 dnsaddr,                        multiaddr,      0x38,           permanent,
 pkix-pub,                       key,            0x40,           draft,      DER-encoded ASN.1 type SubjectPublicKeyInfo (SPKI) according to IETF RFC 5280 section 4.1.2.7; public key algorithm identified by the embedded AlgorithmIdentifier OID
 pkcs8-priv,                     key,            0x41,           draft,      DER-encoded ASN.1 type OneAsymmetricKey (PKCS #8) according to IETF RFC 5958 section 2; private key algorithm identified by the embedded AlgorithmIdentifier OID
+cose-key,                       key,            0x42,           draft,      CBOR-encoded COSE_Key (CBOR map) according to IETF RFC 9052 section 7; media type application/cose-key; kty/alg/crv parameters identify the key algorithm; may carry public/private/symmetric key material depending on which parameters are present
+cose-key-set,                   key,            0x43,           draft,      CBOR-encoded COSE_KeySet (CBOR array of COSE_Key) according to IETF RFC 9052 section 7; media type application/cose-key-set; each element processed independently
 protobuf,                       serialization,  0x50,           draft,      Protocol Buffers
 cbor,                           ipld,           0x51,           permanent,  CBOR
 raw,                            ipld,           0x55,           permanent,  raw binary