chore: code dedup in felt from bigint

[ArniStarkware]

This change is 

[ArniStarkware]

crates/starknet-types-core/src/felt/mod.rs line 565 at r1 (raw file):

impl From<&BigInt> for Felt {
    fn from(bigint: &BigInt) -> Felt {
        let (sign, bytes) = bigint.to_bytes_le();

the method to_bytes_le gets a referance.

    pub fn to_bytes_le(&self) -> (Sign, Vec<u8>) {
        (self.sign, self.data.to_bytes_le())
    }

Code quote:

bigint.to_bytes_le()

[ArniStarkware]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @dan-starkware and @pefontana)

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crates/starknet-types-core/src/felt/mod.rs line 583 at r1 (raw file):

impl From<&BigUint> for Felt {
    fn from(biguint: &BigUint) -> Felt {
        Felt::from_bytes_le_slice(&biguint.to_bytes_le())

the method to_bytes_le gets a referance.

    pub fn to_bytes_le(&self) -> (Sign, Vec<u8>) {
        (self.sign, self.data.to_bytes_le())
    }

Code quote:

biguint.to_bytes_le()