feat(editor): add Composite Editor onRendered lifecycle callback option

[ghiscoding]

• with the new Dark Mode, we needed a way to add attributes to the composite modal element when using Bootstrap, this new lifecycle is to help with that

[stackblitz]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.8%. Comparing base (4ef94fb) to head (e4c4c5a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1410     +/-   ##
========================================
+ Coverage    99.8%   99.8%   +0.1%     
========================================
  Files         199     199             
  Lines       21597   21599      +2     
  Branches     7085    7086      +1     
========================================
+ Hits        21533   21535      +2     
  Misses         58      58             
  Partials        6       6             

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