fix: export node classes at top level

[bdraco]

pylint cannot see the cythonized versions but it should be able to see the top level ones

home-assistant/core#140861 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.21%. Comparing base (c2a1fdb) to head (21c9351).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #20   +/-   ##
=======================================
  Coverage   94.21%   94.21%           
=======================================
  Files           8        8           
  Lines         380      380           
  Branches       52       52           
=======================================
  Hits          358      358           
  Misses         11       11           
  Partials       11       11           

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[codspeed-hq]

CodSpeed Performance Report

Merging #20 will not alter performance

_{Comparing input_node (21c9351) with main (c2a1fdb)}

Summary

✅ 2 untouched benchmarks

[bdraco]

thanks