feat(LayoutAnimation): Adds scaleXY support for LayoutAnimation

[rozele]

Previously, only update and opacity animations were supported in LayoutAnimation. This change uses ScaleTransform to support scaleXY LayoutAnimation.

Fixes #217

[msftclas]

@rozele,
Thanks for your contribution as a Microsoft full-time employee or intern. You do not need to sign a CLA.
Thanks,
Microsoft Pull Request Bot

[codecov-io]

Codecov Report

Merging #1235 into master will decrease coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1235      +/-   ##
==========================================
- Coverage   31.79%   31.76%   -0.04%     
==========================================
  Files         258      258              
  Lines       18667    18685      +18     
  Branches     1578     1580       +2     
==========================================
- Hits         5936     5935       -1     
- Misses      12574    12592      +18     
- Partials      157      158       +1

Impacted Files	Coverage Δ
...d/UIManager/LayoutAnimation/BaseLayoutAnimation.cs	0% <0%> (ø)	⬆️
...tNative.Shared/Modules/Network/NetworkingModule.cs	65.57% <0%> (-0.37%)	⬇️

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