add ModelStore to top level imports

[dmpetrov]

Forgotten part

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.55%. Comparing base (baec8e0) to head (fb5ae29).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #112   +/-   ##
=======================================
  Coverage   85.55%   85.55%           
=======================================
  Files          93       93           
  Lines        9468     9469    +1     
  Branches     1889     1889           
=======================================
+ Hits         8100     8101    +1     
  Misses       1039     1039           
  Partials      329      329           

Flag	Coverage Δ
datachain	85.48% <100.00%> (+<0.01%)	⬆️

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[mattseddon]

To guarantee this doesn't get broken you should test the import at: tests/unit/test_module_exports.py