fix(selection): filter data should work with row selection, closes #295

[ghiscoding]

• a new property "filteredDataContextIds" was added to handle possible filtered data with row selection

[codecov]

Codecov Report

Merging #393 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #393    +/-   ##
======================================
  Coverage     100%   100%            
======================================
  Files         141    141            
  Lines        8832   8834     +2     
  Branches     2918   3045   +127     
======================================
+ Hits         8832   8834     +2

Impacted Files	Coverage Δ
...s/angular-slickgrid/services/pagination.service.ts	100% <100%> (ø)	⬆️

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