Add parsable raw string representation of Money object

[filipmacek]

Pull Request

Currently to_str function of Money object returns a string representation of a number with an underscore. For example, we return 10_000.00 USD instead of more native 10000.00 USD(and easier to parse by other systems).
This looks right in logging where its easier to see bigger numbers with this separator but poses a problem for parsing with Rust where we cannot deserialize it back to the Money type. A lot of these from_dict functions rely on serde_json to convert it back to native Rust type, and they fail on Money type deserialization
So to_raw_str was created to represent this more parsing-friendly format and it was added across to_dict method of instruments

[filipmacek]

Closing, as it was resolved by Rust parsing fix