feat: add Dark Mode grid option

[ghiscoding]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 22.71%. Comparing base (c5c927a) to head (c9b9c68).

Files	Patch %	Lines
...slickgrid/src/custom-elements/aurelia-slickgrid.ts	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1163      +/-   ##
==========================================
- Coverage   22.99%   22.71%   -0.27%     
==========================================
  Files           8        8              
  Lines         892      903      +11     
  Branches      314      321       +7     
==========================================
  Hits          205      205              
- Misses        687      698      +11     

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