[2.14.1-dev.1] Implement EcNegNz Libfunc

[DiegoCivi]

Cairo version 2.14.1-dev.1 introduces a new libfunc:

/// Computes the negation of a non-zero elliptic curve point (-p).
extern fn ec_neg_nz(p: NonZeroEcPoint) -> NonZeroEcPoint nopanic;

See CASM lowering from more information: https://github.com/starkware-libs/cairo/blob/4c85c2fd38f8039fdad5653b191917570f8d79eb/crates/cairo-lang-sierra-to-casm/src/invocations/ec.rs#L290