Adding a .sample operator

[cmungall]

See also #793

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 16.66667% with 15 lines in your changes missing coverage. Please review.

Project coverage is 74.47%. Comparing base (5bec328) to head (af187dc).
Report is 6 commits behind head on main.

Files	Patch %	Lines
src/oaklib/query.py	16.66%	15 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff            @@
##             main     #797    +/-   ##
========================================
  Coverage   74.47%   74.47%            
========================================
  Files         281      282     +1     
  Lines       33453    33559   +106     
========================================
+ Hits        24914    24993    +79     
- Misses       8539     8566    +27     

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