Commits on Apr 21, 2021

1. elliptic-curve: add Order trait …

   Adds a trait which notably does *not* depend on the `arithmetic` feature
   which allows associating a constant for the curve's order with a
   particular curve type.
   
   Since it stores the curve type as a constant, it's not possible to use
   `GenericArray`, so instead it has each curve specify a `Limbs` type
   which is used as the type for an `ORDER` constant.
   
   The longer-term goal will be to merge this with the `Curve` trait,
   ensuring that every curve implementation has a known order regardless of
   whether it provides an arithmetic backend or not.
   
   This can be used as the foundation for making certain functionality
   generic across curve implementations at a baseline, such as checking if
   scalars are in-range, and as such can simplify things which are
   presently conditionally defined based on the presence or absence of an
   arithmetic backend.

   

   tarcieri committed Apr 21, 2021
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