feat(services): add Toggle Filtering/Sorting & Hide Column methods

[ghiscoding]

• The new methods are:
  • filterService.toggleFilterFunctionality()
  • sortService.toggleSortFunctionality()
  • gridService.hideColumnByIndex(columnIndex)
  • gridService.hideColumn(column)

[codecov]

Codecov Report

Merging #587 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #587    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          148       148            
  Lines         9831      9894    +63     
  Branches      3472      3346   -126     
==========================================
+ Hits          9831      9894    +63     

Impacted Files	Coverage Δ
...s/angular-slickgrid/extensions/extensionUtility.ts	100.00% <ø> (ø)
...ngular-slickgrid/extensions/headerMenuExtension.ts	100.00% <100.00%> (ø)
...dules/angular-slickgrid/services/filter.service.ts	100.00% <100.00%> (ø)
...modules/angular-slickgrid/services/grid.service.ts	100.00% <100.00%> (ø)
...modules/angular-slickgrid/services/sort.service.ts	100.00% <100.00%> (ø)
...pp/modules/angular-slickgrid/services/utilities.ts	100.00% <100.00%> (ø)

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