pub fn fn_supported_signature_schemes_extension_append(
signature_schemes: &Vec<SignatureScheme>,
signature_scheme: &SignatureScheme,
) -> Result<Vec<SignatureScheme>, FnError>pub fn fn_supported_signature_schemes_extension_append(
signature_schemes: &Vec<SignatureScheme>,
signature_scheme: &SignatureScheme,
) -> Result<Vec<SignatureScheme>, FnError>