TLS ECH Config Decoder
Decode an ECH Config (Encrypted Client Hello) in base64/hex showing version, kem_id, kdf_id, aead_id, public_name and public_key.
Estrutura: ECHConfigList { ECHConfig[] }. Cada ECHConfig: version (2 bytes) + length (2) + contents { config_id (1) + kem_id (2) + public_key (var) + cipher_suites { (kdf,aead) } + max_name_length (1) + public_name (var) + extensions }. Apenas draft-ietf-tls-esni-22 / version 0xfe0d (RFC 9460).
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