feat(storage): request types for mocking

[dbolduc]

Part of the work for #2041

These request types will factor into our mock interfaces. We need to make them public.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.50%. Comparing base (98ea476) to head (9de3a0f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3155   +/-   ##
=======================================
  Coverage   96.50%   96.50%           
=======================================
  Files         108      108           
  Lines        4411     4411           
=======================================
  Hits         4257     4257           
  Misses        154      154           

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