k256: implement AffinePoint::identity()
and ::is_identity()
#165
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Adds a
Choice
field toAffinePoint
which encodes whether the point represents the point at infinity.Inspired by the method used in the
bls12_381
crate:https://github.com/zkcrypto/bls12_381/blob/0d2c06dd/src/g1.rs#L25-L29