feat(services): pluralize CRUD events (ie: onItemsAdded, ...)

[ghiscoding]

Our GridService has CRUD event that was sometime returning a single item or sometime multiple items and for that reason we had to rely on code like onItemAdded.subscribe(item => { const items = Array.isArray(item) ? item : [item] }, but if we always return an array then we know exactly the shape of items.

[bolt-new-by-stackblitz]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.0%. Comparing base (87823a9) to head (52c5249).
Report is 1 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #1910   +/-   ##
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  Coverage   100.0%   100.0%           
=======================================
  Files         187      187           
  Lines       34517    34517           
  Branches    10280    10279    -1     
=======================================
  Hits        34491    34491           
  Misses         26       26           

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