elliptic-curve: factor out FieldBytesEncoding trait
#1235
Merged
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Extracts a trait to be impl'd on
Curve::Uintwhich provides curve-specific rules for how field elements should be encoded as bytes.These rules include both endianness and how to pad/truncate bytes to match the size of the integer (which may be larger than the size of the field modulus, to be a multiple of the limb size)