Beefy client v2

[vgeddes]

Initial groundwork for the Fiat-Shamir single-phase commitment protocol (#1562). Refactors and updates many validation routines for improved clarity, redundancy, and defense in depth.

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.10%. Comparing base (3aba4b5) to head (902dd56).
⚠️ Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
contracts/src/BeefyClient.sol	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1571      +/-   ##
==========================================
+ Coverage   81.08%   81.10%   +0.02%     
==========================================
  Files          21       21              
  Lines         867      868       +1     
  Branches      150      151       +1     
==========================================
+ Hits          703      704       +1     
  Misses        141      141              
  Partials       23       23              

Flag	Coverage Δ
solidity	81.10% <92.30%> (+0.02%)	⬆️

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[yrong]

#1572 with more tests.

[yrong]

+1