Function payload_to_new_payload 

pub(crate) fn payload_to_new_payload(
    payload: ExecutionPayload,
    sidecar: ExecutionPayloadSidecar,
    is_optimism: bool,
    withdrawals_root: Option<B256>,
    target_version: Option<EngineApiMessageVersion>,
) -> Result<(EngineApiMessageVersion, Value, ExecutionData)>

Converts an execution payload and sidecar into versioned engine API params and an [ExecutionData].

Returns (version, versioned_params, execution_data).