generate Randomizer by hashing SigningPackage

[conradoplg]

Depends on #541

Part of #525

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.34% 🎉

Comparison is base (a5dc479) 81.43% compared to head (b7204e0) 81.77%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #542      +/-   ##
==========================================
+ Coverage   81.43%   81.77%   +0.34%     
==========================================
  Files          30       30              
  Lines        3027     3084      +57     
==========================================
+ Hits         2465     2522      +57     
  Misses        562      562              

Files Changed	Coverage Δ
frost-ed25519/src/lib.rs	65.92% <100.00%> (+1.86%)	⬆️
frost-ed448/src/lib.rs	65.92% <100.00%> (+1.86%)	⬆️
frost-p256/src/lib.rs	69.53% <100.00%> (+1.26%)	⬆️
frost-rerandomized/src/lib.rs	86.42% <100.00%> (+2.80%)	⬆️
frost-ristretto255/src/lib.rs	66.16% <100.00%> (+1.87%)	⬆️
frost-secp256k1/src/lib.rs	69.33% <100.00%> (+1.27%)	⬆️

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[conradoplg]

rebased after base merged

[natalieesk]

Looks good