`support/ark_ff_04`: Implement the `BigInteger` trait.

[github-actions]

On 2023-07-24 @prestwich wrote in fdf65e6 “Merge pull request #266 from alloy-rs/dani/ark”:

Implement the BigInteger trait.

    biginteger::BigInt,
    fields::models::{Fp, FpConfig},
    PrimeField,
};

// FEATURE: Implement the `BigInteger` trait.

// BigInt

impl<const BITS: usize, const LIMBS: usize> From<BigInt<LIMBS>> for Uint<BITS, LIMBS> {
    fn from(value: BigInt<LIMBS>) -> Self {

From src/support/ark_ff_04.rs:12