perf(resizer): autosizeColumns is called too many times on page load

[ghiscoding]

• when loading a new grid, we are calling grid.autosizeColumns() to resize the columns and while adding tests for that method I incidently discovered that it was being called multiple times on a page load (up to 6-8x times) but in reality there is no need to call it more than once or twice.
• there is also no need to call the autosizeColumns if the grid dimension calculated by the Resizer Service are the same as the previously calculated dimensions
• the updated code will never call autosizeColumns more than twice on a page load, however note that the method will always be called whenever the grid dimensions or columns get updated

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (8b418f2) 22.91% compared to head (8c33b36) 22.76%.

Files	Patch %	Lines
...slickgrid/src/custom-elements/aurelia-slickgrid.ts	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1148      +/-   ##
==========================================
- Coverage   22.91%   22.76%   -0.15%     
==========================================
  Files           8        8              
  Lines         895      901       +6     
  Branches      314      315       +1     
==========================================
  Hits          205      205              
- Misses        690      696       +6     

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