feat(core): add rowHighlightCssClass & highlightRow() to SlickGrid

[ghiscoding]

• remove previous highlightRowByMetadata() method in GridService, we can avoid using ItemMetaData altogether by adding a simple highlightRow() method directly in the SlickGrid core lib and also add rowHighlightCssClass grid option which will be animated by default but user could also disable the animation and/or even disable the fade out (remain highlighted)
• this new approach simplifies the code a lot and doesn't require the use of ItemMetadata and calling multiple updateItem() and render() which is much better for performance
• also fixes an issue that was previously happening when inserting multiple items before the highlight timer had time to finish, that was leaving multiple row highlighted when they shouldn't.
• also fix potential mem leak found on some setTimeout not having any clearTimeout assigned which could cause potential mem leaks
• fixes opened Angular-Slickgrid issue All items in grid appear highlighted after adding an item to the grid Angular-Slickgrid#1332

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (14791e7) 86.71% compared to head (2e5926b) 87.17%.

Files	Patch %	Lines
packages/common/src/core/slickGrid.ts	68.19%	7 Missing ⚠️
packages/common/src/services/grid.service.ts	30.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1272      +/-   ##
==========================================
+ Coverage   86.71%   87.17%   +0.47%     
==========================================
  Files         197      197              
  Lines       21377    21366      -11     
  Branches     7107     7103       -4     
==========================================
+ Hits        18534    18624      +90     
+ Misses       2843     2742     -101     

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