feat: forward modal-close event to children on modal close

[muselesscreator]

This allows children that prompt the opening of a modal with plugin.modal to receive plugin.modal-close event when the modal closes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (62465ec) 88.09% compared to head (8927e6e) 87.48%.
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1238      +/-   ##
==========================================
- Coverage   88.09%   87.48%   -0.62%     
==========================================
  Files         268      275       +7     
  Lines        4537     4729     +192     
  Branches     1145     1195      +50     
==========================================
+ Hits         3997     4137     +140     
- Misses        526      575      +49     
- Partials       14       17       +3     

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