feat: Stackable ops

[dodamih]

No description provided.

[nkemnitz]

This PR seems to contain several unrelated changes - would you consider splitting them up? That way you don't need 3 reviewers looking over all changes, and get feedback on the individual ideas much faster
I would also suggest to put the necessary pins manually in requirements.txt for now (i.e. updated cloudvolume) to avoid additional side effects from all the unrelated package updates.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.98%. Comparing base (0ea9a04) to head (01e3059).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1141   +/-   ##
=======================================
  Coverage   99.97%   99.98%           
=======================================
  Files         191      191           
  Lines        9948    10011   +63     
=======================================
+ Hits         9946    10009   +63     
  Misses          2        2           

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