Behavior changes - The default query image size now changed to PHImageManagerMaximumSize

[dreampiggy]

This is because the previous version use SDWebImagePhotosPixelSize, which may return a larger size beyond system RAM limit.

For Example, if you use SDWebImagePhotosPixelSize to query an iPhone 5K Deep Depth Photo, iOS will return nearly 8000x8000 pixels, cause a high rate of OOM.

Use PHImageManagerMaximumSize, can only return you nearly 4000x4000 pixels, suitable for current iPhone's display.

This change is noticable, but it's suitable for most of common cases, we still query the as large as possible to original image by default. Only try to workaround with that OOM issue.

[codecov]

Codecov Report

Merging #16 into master will increase coverage by 1.85%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   61.85%   63.70%   +1.85%     
==========================================
  Files           3        3              
  Lines         270      270              
==========================================
+ Hits          167      172       +5     
+ Misses        103       98       -5     

Flag	Coverage Δ
#iOS	63.70% <0.00%> (+1.85%)	⬆️

Impacted Files	Coverage Δ
...ses/PHImageRequestOptions+SDWebImagePhotosPlugin.m	75.00% <0.00%> (ø)
...WebImagePhotosPlugin/Classes/SDImagePhotosLoader.m	60.36% <0.00%> (+2.25%)	⬆️

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