reject compressed public keys

[tofay]

add kx whycheproof tests

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.79%. Comparing base (9d5c005) to head (f1f8447).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/kx.rs	91.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   85.62%   85.79%   +0.17%     
==========================================
  Files          12       12              
  Lines        1238     1274      +36     
==========================================
+ Hits         1060     1093      +33     
- Misses        178      181       +3     

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