feat: add scalar_mult function to main.rs for Bn254 point multiplication #1708
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scalar_mult function: This function takes a reference to a point (Bn254Point) and a scalar (32-byte array) as inputs. It performs scalar multiplication, returning a new Bn254Point that represents the resulting point after multiplication.
Bn254Scalar Conversion: The scalar byte array is converted into a Bn254Scalar using from_bytes, enabling multiplication with the point.
Usage: This function is helpful when performing cryptographic operations that require scalar multiplication of points, such as in zero-knowledge proof computations.