piecepack_kangaroo() and piecepack_leapfrog()

[trevorld]

• feat: checker_kangaroo() and piecepack_kangaroo()
• feat: piecepack_leapfrog()

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.26%. Comparing base (d5bd5a8) to head (dbed9c8).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #98   +/-   ##
=======================================
  Coverage   99.25%   99.26%           
=======================================
  Files          33       33           
  Lines        4046     4067   +21     
=======================================
+ Hits         4016     4037   +21     
  Misses         30       30           

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