Function create_order_to_call 

pub fn create_order_to_call(
    contract_id: &[u8; 32],
    side: &str,
    price: u64,
    quantity: u64,
    order_type: &OrderTypeEncoding,
    base_decimals: u32,
    base_asset: &[u8; 32],
    quote_asset: &[u8; 32],
) -> CallArg

Convert a high-level CreateOrder action to a low-level CallArg.