fix(grouping): DraggableGrouping could throw when leaving page

[ghiscoding]

• this fixes 2 issues identified in Angular-Slickgrid, can't access property "length", a.sharedService.visibleColumns is undefined when hiding column Angular-Slickgrid#1180
• when leaving a SPA page and going back to it, it could throw a bunch of errors. We simply need to make sure that any sortable instances are destroyed before recreating any new ones. The second issue is an array that could be undefined and could throw an error

The error comes from SortableJS from this line
https://github.com/SortableJS/Sortable/blob/7af63fdc5d7512e7f0b8abb10970d473521b31a5/Sortable.js#L1115

[codecov]

Codecov Report

Merging #1019 (2c2cba3) into master (30a0748) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1019   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          244       244           
  Lines        16558     16560    +2     
  Branches      5931      5931           
=========================================
+ Hits         16558     16560    +2     

Impacted Files	Coverage Δ
...ages/common/src/extensions/extensionCommonUtils.ts	100.00% <100.00%> (ø)
...es/common/src/extensions/slickDraggableGrouping.ts	100.00% <100.00%> (ø)