[FEATURE]: Add HPKE (RFC 9180) to Cryptography Registry

[Mehrn0ush]

Describe the feature

What:
Add HPKE (Hybrid Public Key Encryption, RFC 9180) as a cryptographic algorithm family to the Cryptography Registry.

Why:
HPKE is a widely deployed, standardized construction (KEM+KDF+AEAD). Adding it enables consistent algorithm identification and avoids ad-hoc naming across SBOM/CBOM tooling.

Proposed registry entry:

• Family: HPKE
• Primitive: pke
• Pattern: HPKE[-{mode}]-{kem}-{kdf}-{aead}
• Standard: RFC 9180 (https://doi.org/10.17487/RFC9180)

Possible solutions

Add an HPKE family entry to schema/cryptography-defs.json and allow HPKE in the family enum in schema/cryptography-defs.schema.json.

Alternatives

Leave it unregistered and rely on inconsistent names across tools.

Additional context

Registry-only addition. No schema/spec behavior changes beyond allowing the new family name in the registry schema.