feat(services): add bulk transactions in Grid Service CRUD methods

[ghiscoding]

• ref SlickGrid new bulk transaction PR

[codecov]

Codecov Report

Merging #687 (e46b986) into master (c0befb7) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #687    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          157       157            
  Lines        10453     10473    +20     
  Branches      3515      3680   +165     
==========================================
+ Hits         10453     10473    +20     

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

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