feat: Add JsonTypeSet::len & JsonTypeSet::remove

[Stranger6667]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.12%. Comparing base (345bb71) to head (025d1ed).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #891   +/-   ##
=======================================
  Coverage   94.11%   94.12%           
=======================================
  Files          78       78           
  Lines       16472    16499   +27     
=======================================
+ Hits        15502    15529   +27     
  Misses        970      970           

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[codspeed-hq]

CodSpeed Performance Report

Merging #891 will not alter performance

_{Comparing dd/add-methods-to-types (025d1ed) with master (6b76fd9)}

Summary

✅ 61 untouched