evmmax: Make ModArith header-only and constexpr

[rodiazet]

Move all ModArith's methods to the class definition and make them constexpr.

Change evmmax library type to INTERFACE.

[codecov]

Codecov Report

Attention: Patch coverage is 97.95918% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.29%. Comparing base (391bd64) to head (81d067e).

Files	Patch %	Lines
test/unittests/evmmax_test.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #964      +/-   ##
==========================================
- Coverage   94.29%   94.29%   -0.01%     
==========================================
  Files         143      143              
  Lines       16128    16131       +3     
==========================================
+ Hits        15208    15210       +2     
- Misses        920      921       +1     

Flag	Coverage Δ
eof_execution_spec_tests	16.64% <0.00%> (-0.23%)	⬇️
ethereum_tests	26.93% <97.95%> (+<0.01%)	⬆️
ethereum_tests_silkpre	18.69% <100.00%> (+<0.01%)	⬆️
execution_spec_tests	17.73% <0.00%> (-0.23%)	⬇️
unittests	89.72% <97.95%> (-0.01%)	⬇️

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

Files	Coverage Δ
include/evmmax/evmmax.hpp	100.00% <100.00%> (ø)
lib/evmone_precompiles/bn254.cpp	100.00% <ø> (ø)
lib/evmone_precompiles/secp256k1.cpp	100.00% <ø> (ø)
test/unittests/evmmax_test.cpp	96.55% <0.00%> (-1.70%)	⬇️

[chfast]

These are the rough performance improvements:

precompile<PrecompileId::ecrecover, evmmax_cpp>_mean                       -0.0445         -0.0445        409414        391193        409365        391152
precompile<PrecompileId::ecadd, evmmax_cpp>_mean                           -0.0008         -0.0007          9156          9148          9153          9147
precompile<PrecompileId::ecmul, evmmax_cpp>_mean                           -0.0639         -0.0636        190056        177917        189981        177891