UIImage Additions

[tylerjonesio]

I use UIImage's quite heavily in my app and there were a couple of API surfaces missing that I've added here.

1. Image .size
2. Thumbnail creation with .byPreparingThumbnail(ofSize: _)

One thing to note is that unfortunately CGSize, wasn't bridgable. So for skip fuse access, I've added separate functions/accessors that take individual CGFloats for width and height.

Skip Pull Request Checklist:

• REQUIRED: I have signed the Contributor Agreement
• REQUIRED: I have tested my change locally with swift test
• OPTIONAL: I have tested my change on an iOS simulator or device
• OPTIONAL: I have tested my change on an Android emulator or device
• REQUIRED: I have checked whether this change requires a corresponding update in the Skip Fuse UI repository (link related PR if applicable)
  • UIImage Additions skip-fuse-ui#100
• OPTIONAL: I have added an example of any UI changes in the Showcase sample app
  • UIImage Additions skipapp-showcase#89
  • UIImage Additions skipapp-showcase-fuse#60

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[marcprux]

Looks great!

And thanks for doing the whole 4-repo PR dance for completeness.