test: Add test case for huge modexp input

[chfast]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.09%. Comparing base (89bfa23) to head (7567a90).

Files with missing lines	Patch %	Lines
test/unittests/precompiles_expmod_test.cpp	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1332   +/-   ##
=======================================
  Coverage   87.09%   87.09%           
=======================================
  Files         169      169           
  Lines       24864    24866    +2     
  Branches     4081     4081           
=======================================
+ Hits        21656    21658    +2     
  Misses        546      546           
  Partials     2662     2662           

Flag	Coverage Δ
eest-develop	84.17% <ø> (ø)
eest-develop-gmp	15.83% <0.00%> (-0.01%)	⬇️
eest-legacy	11.10% <0.00%> (-0.01%)	⬇️
eest-legacy-silkpre	17.56% <0.00%> (-0.01%)	⬇️
evmone-unittests	83.89% <66.66%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
core	93.55% <ø> (ø)
tooling	86.50% <ø> (ø)
tests	84.13% <66.66%> (+<0.01%)	⬆️

Files with missing lines	Coverage Δ
test/unittests/precompiles_expmod_test.cpp	96.00% <66.66%> (+0.04%)	⬆️

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