ProcessGenerator: allow for pickling

[mr-c]

• needs Loader: enable pickling schema_salad#924

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.74%. Comparing base (2dce710) to head (1cfde26).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2113   +/-   ##
=======================================
  Coverage   84.74%   84.74%           
=======================================
  Files          46       46           
  Lines        8364     8364           
  Branches     1961     1961           
=======================================
  Hits         7088     7088           
- Misses        807      808    +1     
+ Partials      469      468    -1     

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