piecepack_preview(), piecepack_pyramids(), piecepack_saucers()

[trevorld]

• fix(fill_piece()): sample(n) treated as sample(1:n) even when not desired

• feat: piecepack_pyramids() and piecepack_saucers()

• feat: piecepack_preview() (piecepack_preview() #35)

closes #35

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.24%. Comparing base (35b94a0) to head (770fd12).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
+ Coverage   99.23%   99.24%   +0.01%     
==========================================
  Files          32       33       +1     
  Lines        3907     3960      +53     
==========================================
+ Hits         3877     3930      +53     
  Misses         30       30              

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