feat(pinning): add "Frozen Columns" to header menu

[ghiscoding]

• this feature will basically allow the user to freeze all columns until the current position of the column header he opened. For example if user is opening column 4 header menu and click on "Frozen Columns", it will freeze all 4 columns on the left.

• requires PR #513 on core lib to be

  • merged
  • and released

[codecov]

Codecov Report

Merging #494 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #494   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          148       148           
  Lines         9589      9621   +32     
  Branches      3208      3221   +13     
=========================================
+ Hits          9589      9621   +32     

Impacted Files	Coverage Δ
src/app/modules/angular-slickgrid/constants.ts	100.00% <ø> (ø)
...ular-slickgrid/extensions/columnPickerExtension.ts	100.00% <100.00%> (ø)
.../angular-slickgrid/extensions/gridMenuExtension.ts	100.00% <100.00%> (ø)
...ngular-slickgrid/extensions/headerMenuExtension.ts	100.00% <100.00%> (ø)
...r-slickgrid/services/groupingAndColspan.service.ts	100.00% <100.00%> (ø)

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