Add mate distance pruning

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87%. Comparing base (a13aea9) to head (a1d3d16).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #223 +/- ## ===================================== + Coverage 87% 87% +1% ===================================== Files 32 33 +1 Lines 4274 4291 +17 Branches 4274 4291 +17 ===================================== + Hits 3681 3698 +17 Misses 577 577 Partials 16 16 ```

[github-actions[bot]]

Against master [hash=64; threads=1]: 🆗 Elo difference: -6.95 +/- 21.89, LOS: 26.69 %, DrawRatio: 38.00 %

[github-actions[bot]]

Against v1.5.0 [hash=64; threads=1]: 🆗 Elo difference: 11.59 +/- 21.89, LOS: 85.01 %, DrawRatio: 38.00 %

[github-actions[bot]]

Against v1.5.0 [hash=256; threads=4]: 🆗 Elo difference: 34.86 +/- 37.13, LOS: 96.72 %, DrawRatio: 41.00 %

[github-actions[bot]]

Against master [hash=256; threads=4]: 🆗 Elo difference: 8.69 +/- 37.23, LOS: 67.66 %, DrawRatio: 40.50 %