feat(addon): add group by sorting to SlickDraggableGrouping

[ghiscoding]

• provide an extra sort icon beside each group which allow us to sort each group independently
• user can also chose to disable this new feature by using the hideGroupSortIcons option

[codecov]

Codecov Report

Merging #814 (eab7e98) into master (a25791a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #814   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          238       239    +1     
  Lines        16308     16365   +57     
  Branches      5524      5547   +23     
=========================================
+ Hits         16308     16365   +57     

Impacted Files	Coverage Δ
...es/common/src/extensions/slickDraggableGrouping.ts	100.00% <100.00%> (ø)
...es/common/src/sortComparers/booleanSortComparer.ts	100.00% <100.00%> (ø)
packages/common/src/sortComparers/index.ts	100.00% <100.00%> (ø)
...es/common/src/sortComparers/sortComparers.index.ts	100.00% <100.00%> (ø)
packages/common/src/sortComparers/sortUtilities.ts	100.00% <100.00%> (ø)

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