`support/ark_ff_05`: Implement the `BigInteger` trait.

[github-actions]

On 2025-09-15 @prestwich wrote in 713e3dc “Merge pull request #526 from TaceoLabs/feat/ark-ff-05”:

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_05.rs:12