Add a helper method to re-create a pipeline object from a chain output file.

[joezuntz]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.14%. Comparing base (5c5d1b5) to head (ba51ada).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #151      +/-   ##
==========================================
+ Coverage   61.94%   62.14%   +0.19%     
==========================================
  Files         117      117              
  Lines       12470    12528      +58     
==========================================
+ Hits         7725     7785      +60     
+ Misses       4745     4743       -2     

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