Remove dataclasses-json

[pingsutw]

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• I updated the documentation accordingly.
• All new and existing tests passed.
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[davidmirror-ops]

ty

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.67%. Comparing base (330a1e8) to head (b0bcbf0).
⚠️ Report is 1 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (330a1e8) and HEAD (b0bcbf0). Click for more details.

HEAD has 62 uploads less than BASE

Flag	BASE (330a1e8)	HEAD (b0bcbf0)
	64	2

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3377       +/-   ##
===========================================
- Coverage   81.53%   47.67%   -33.86%     
===========================================
  Files         324      216      -108     
  Lines       28004    22718     -5286     
  Branches     2981     2981               
===========================================
- Hits        22832    10831    -12001     
- Misses       4335    11309     +6974     
+ Partials      837      578      -259     

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