Add support a 'contain' resize mode for Android

[retyui]

This PR adds breaking changes!

Test Plan

1. Install:

npx react-native init testEditor
cd testEditor
yarn add retyui/react-native-image-editor#android-contain-resize-mode

2. Paste code from example/App.js

3. Extends crop data

const cropData: ImageCropData = {
  offset: {
    x: this.props.image.width * offsetRatioX,
    y: this.props.image.height * offsetRatioY,
  },
  size: {
    width: this.props.image.width * sizeRatioX,
    height: this.props.image.height * sizeRatioY,
  },
+  resizeMode: 'contain',
+  displaySize: {
+    width: 2000,
+    height: 1000,
+  },
};

What's required for testing (prerequisites)?

What are the steps to reproduce (after prerequisites)?

Compatibility

OS	Implemented
iOS	✅
Android	✅

Checklist

• [x] I have tested this on a device and a simulator
• [x] I added the documentation in README.md
• [ ] I mentioned this change in CHANGELOG.md
• [x] I updated the typed files (TS and Flow)
• [ ] I added a sample use of the API in the example project (example/App.js)

[retyui]

another polite reminder @EvanBacon , @Naturalclar

[EvanBacon]

I apologize but I'm not familiar with this package.