Include RowType in __all__

[cdce8p]

RowType might be useful when annotating subclasses.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.48%. Comparing base (f044b0e) to head (084f86e). Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #333      +/-   ##
==========================================
- Coverage   94.51%   94.48%   -0.04%     
==========================================
  Files           5        5              
  Lines        2462     2629     +167     
==========================================
+ Hits         2327     2484     +157     
- Misses        135      145      +10     

Flag	Coverage Δ
macos-latest	?
ubuntu-latest	?
windows-latest	94.48% <ø> (?)

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