Commits on Jul 5, 2024

1. Make the -sys crate optional …

   Downstream projects, such as `bitcoin` are using types from this crate
   and need to compile the C code even if they only use the types for
   checking validity of the data and don't perform cryptographic
   operations. Compiling C code is slow and unreliable so there was desire
   to avoid this.
   
   This commit introduces pure Rust implementation of basic
   non-cryptographic operations (is point on the curve, decompression of
   point, secret key constant time comparisons) and feature-gates
   cryptographic operations on `secp256k1-sys` which is now optional. To
   make use of this, downstream crates will have to deactivate the feature
   and possibly feature gate themselves.
   
   The implementation requires a U256 type which was copied from the
   `bitcoin` crate. We don't depend on a common crate to avoid needless
   compilation when the feature is turned on.
   
   This is a breaking change because users who did cryptographic operations
   with `default-features = false` will get compilation errors until they
   enable the feature.

   

   Kixunil committed Jul 5, 2024
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