feat(state): add Pinning (frozen) to Grid State & Presets

[ghiscoding]

TODOs

• get Pinning from Grid State
• use Pinning from grid options presets
• add clearPinning and setPinning
• add Cypress E2E tests to
  • save Grid State & expect Grid Presets to reload the Pinning/Freezing
• rename grid menu to "Unfreeze Columns/Rows" and in French "Dégeler les colonnes/rangées"

[codecov]

Codecov Report

Merging #724 (0ea9fb4) into master (fb7dcd6) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #724   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          159       159           
  Lines        10708     10741   +33     
  Branches      3796      3803    +7     
=========================================
+ Hits         10708     10741   +33     

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

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