Make SimpleQuery, QueryVariable, and Query types available

[bdraco]

What do these changes do?

The previously protected types _SimpleQuery, _QueryVariable, and _Query are now available for use externally.

Are there changes in behavior for the user?

no

Related issue number

closes #1050

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.02%. Comparing base (d080a2e) to head (1e52261).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1113   +/-   ##
=======================================
  Coverage   95.02%   95.02%           
=======================================
  Files          30       30           
  Lines        4459     4466    +7     
  Branches      392      392           
=======================================
+ Hits         4237     4244    +7     
  Misses        196      196           
  Partials       26       26           

Flag	Coverage Δ
CI-GHA	94.98% <100.00%> (+<0.01%)	⬆️
MyPy	40.28% <100.00%> (+0.38%)	⬆️
OS-Linux	99.35% <100.00%> (ø)
OS-Windows	99.45% <100.00%> (ø)
OS-macOS	99.04% <100.00%> (ø)
Py-3.10.11	98.93% <100.00%> (ø)
Py-3.10.14	99.18% <100.00%> (ø)
Py-3.11.9	99.18% <100.00%> (ø)
Py-3.12.5	99.18% <100.00%> (ø)
Py-3.13.0-rc.1	99.18% <100.00%> (ø)
Py-3.8.10	98.87% <100.00%> (ø)
Py-3.8.18	99.09% <100.00%> (-0.04%)	⬇️
Py-3.9.13	98.87% <100.00%> (ø)
Py-3.9.19	?
Py-pypy7.3.11	99.18% <100.00%> (ø)
Py-pypy7.3.16	99.18% <100.00%> (ø)
Py-pypy7.3.17	99.21% <100.00%> (ø)
VM-macos-latest	99.04% <100.00%> (ø)
VM-ubuntu-latest	99.35% <100.00%> (ø)
VM-windows-latest	99.45% <100.00%> (ø)
pytest	99.35% <100.00%> (ø)

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