Add minimum participant constraints

[natalieesk]

This closes #443

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.40% 🎉

Comparison is base (ad07c9e) 76.83% compared to head (7c706db) 77.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #453      +/-   ##
==========================================
+ Coverage   76.83%   77.23%   +0.40%     
==========================================
  Files          30       30              
  Lines        2672     2706      +34     
==========================================
+ Hits         2053     2090      +37     
+ Misses        619      616       -3     

Files Changed	Coverage Δ
frost-core/src/frost/keys.rs	92.16% <100.00%> (+0.80%)	⬆️
frost-core/src/frost/keys/dkg.rs	88.11% <100.00%> (-0.24%)	⬇️
frost-core/src/frost/keys/repairable.rs	97.05% <100.00%> (+0.18%)	⬆️
frost-ed25519/src/keys/repairable.rs	59.09% <100.00%> (+9.09%)	⬆️
frost-ed448/src/keys/repairable.rs	59.09% <100.00%> (+9.09%)	⬆️
frost-p256/src/keys/repairable.rs	59.09% <100.00%> (+9.09%)	⬆️
frost-ristretto255/src/keys/repairable.rs	60.86% <100.00%> (+8.23%)	⬆️
frost-secp256k1/src/keys/repairable.rs	59.09% <100.00%> (+9.09%)	⬆️

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[conradoplg]

Looks good! Do you want to include the new findings in this PR too?

• DKG part1()
• repair_share_step_1()

Also needs rebasing

[conradoplg]

Looks great, thanks!