Add a MultiMult trait and a Point fn which uses it for the multimult operation

[xoloki]

This PR adds a trait MultiMult and a Point::multimult_trait fn which uses it for multimult ops. The existing ScalarsPoints object now implements the trait, and the existing Point::multimult fn now just makes a ScalarsPoints object and passes it to multimult_trait. This resolves #69

The trait also defines a fn get_scratch_size with a default implementation of get_size() * 512, which was empirically determined to be an optimal scratch size. This resolves #17

[codecov[bot]]

Codecov Report

Merging #70 (c94c3fd) into master (e299a92) will increase coverage by 0.05%. The diff coverage is 95.23%.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   55.89%   55.94%   +0.05%     
==========================================
  Files           9       10       +1     
  Lines         662      681      +19     
==========================================
+ Hits          370      381      +11     
- Misses        292      300       +8     

Impacted Files	Coverage Δ
p256k1/src/point.rs	66.83% <94.73%> (-1.32%)	:arrow_down:
p256k1/src/traits.rs	100.00% <100.00%> (ø)

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more

[cloudflare-workers-and-pages[bot]]

Deploying with    Cloudflare Pages

Latest commit:	c94c3fd
Status:	✅  Deploy successful!
Preview URL:	https://308d94a5.p256k1.pages.dev
Branch Preview URL:	https://trait-multi.p256k1.pages.dev

View logs