Call object_from_json from decoder when issubclass(_class, SerializationMixin)

[mpolson64]

Summary: As titled. This solves a relatively common problem (which may crop up again in some recently planning changes) in which the init args of some serializable Ax object is itself a serializable Ax object

Differential Revision: D56356035

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56356035

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.32%. Comparing base (6676720) to head (fca9c15).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2396   +/-   ##
=======================================
  Coverage   95.32%   95.32%           
=======================================
  Files         496      496           
  Lines       48188    48188           
=======================================
  Hits        45935    45935           
  Misses       2253     2253           

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