Get eval tests working for Raw validator

[MitchTurner]

They are broken right now because the Plutus scripts follow different patterns than Aiken, and I've been prioritizing Aiken. The best solution would be to rewrite the scripts in Aiken, but we can also do custom Constrs around some of the data types to make them work

[MitchTurner]

This is what it used to be, and when we removed the constr, it broke some of the tests.

impl From<i64> for PlutusData {
    fn from(num: i64) -> Self {
        let neg = num.is_negative();
        let val = num.unsigned_abs();
        let inner_data = PlutusData::BigInt(BigInt::Int { neg, val });
        let constr = Constr {
            tag: 121,
            any_constructor: None,
            fields: vec![inner_data],
        };
        PlutusData::Constr(constr)
        inner_data
    }
}

I didn't fix it because we do have tests that work with the new behavior, just in the sample-dapps.