fix: add and fix copy operators

[Czaki]

closes #254

This PR fixes copy of EventedSet and add copy operator to EventedList and EventedDic.

[codspeed-hq]

CodSpeed Performance Report

Merging #255 will not alter performance

_{Comparing Czaki:fix_copy (b0c758e) with main (b0d2057)}

Summary

✅ 66 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b0d2057) 99.89% compared to head (b0c758e) 99.89%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #255   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files          22       22           
  Lines        1900     1902    +2     
=======================================
+ Hits         1898     1900    +2     
  Misses          2        2           

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[tlambert03]

thanks again