Implement QueryResult type.

[Davidyz]

Closes #279

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.72%. Comparing base (bf5f94c) to head (b290f30).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
+ Coverage   99.66%   99.72%   +0.06%     
==========================================
  Files          24       25       +1     
  Lines        1788     1837      +49     
==========================================
+ Hits         1782     1832      +50     
+ Misses          6        5       -1     

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