feat: to/from json for extension/package

[ss2165]

Closes #1523

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.70%. Comparing base (f74dbf3) to head (45f9df5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1575      +/-   ##
==========================================
+ Coverage   85.69%   85.70%   +0.01%     
==========================================
  Files         135      135              
  Lines       24563    24574      +11     
  Branches    21512    21512              
==========================================
+ Hits        21050    21062      +12     
+ Misses       2415     2414       -1     
  Partials     1098     1098              

Flag	Coverage Δ
python	92.52% <100.00%> (+0.05%)	⬆️

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