feat(core): use DataView transactions with multiple item changes

[ghiscoding]

• we should use DataView transactions as much as possible when dealing with multiple items (array) in 1 call, that is true for (addItems, deleteItems, updateItems)
  • DataView beginUpdate ... endUpdate

[codecov]

Codecov Report

Merging #527 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #527    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          148       148            
  Lines         9634      9643     +9     
  Branches      3227      3365   +138     
==========================================
+ Hits          9634      9643     +9     

Impacted Files	Coverage Δ
...lickgrid/components/angular-slickgrid.component.ts	100.00% <ø> (ø)
...modules/angular-slickgrid/services/grid.service.ts	100.00% <100.00%> (ø)

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