Function concordium_contracts_common::deserial_map_no_length_no_order_check

pub fn deserial_map_no_length_no_order_check<R: Read, K: Deserial + Ord, V: Deserial>(
    source: &mut R, 
    len: usize
) -> ParseResult<BTreeMap<K, V>>

Read a BTreeMap as a list of key-value pairs given some length. Slightly faster version of deserial_map_no_length as it is skipping the order checking