test: Add benchmarks for the p256verify precompile

[chfast]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.09%. Comparing base (89bfa23) to head (f255cc5).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1333   +/-   ##
=======================================
  Coverage   87.09%   87.09%           
=======================================
  Files         169      169           
  Lines       24864    24864           
  Branches     4081     4081           
=======================================
  Hits        21656    21656           
  Misses        546      546           
  Partials     2662     2662           

Flag	Coverage Δ
eest-develop	84.17% <ø> (ø)
eest-develop-gmp	15.83% <ø> (ø)
eest-legacy	11.10% <ø> (ø)
eest-legacy-silkpre	17.56% <ø> (ø)
evmone-unittests	83.89% <ø> (ø)

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Components	Coverage Δ
core	93.55% <ø> (ø)
tooling	86.50% <ø> (ø)
tests	84.13% <ø> (ø)

Files with missing lines	Coverage Δ
test/state/precompiles.cpp	94.97% <ø> (ø)

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