Add benchmark for negamax

[brunocodutra]

No description provided.

[codecov]

Codecov Report

Merging #196 (e0fd2a3) into master (efa8a97) will increase coverage by 0.16%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #196      +/-   ##
==========================================
+ Coverage   92.79%   92.95%   +0.16%     
==========================================
  Files          31       31              
  Lines        1623     1619       -4     
==========================================
- Hits         1506     1505       -1     
+ Misses        117      114       -3     

Impacted Files	Coverage Δ
src/search.rs	100.00% <ø> (ø)
src/strategy.rs	86.20% <0.00%> (ø)
src/position.rs	89.54% <100.00%> (+0.37%)	⬆️
src/strategy/negamax.rs	93.65% <100.00%> (ø)
src/report.rs	100.00% <0.00%> (+9.52%)	⬆️

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