Work in progress

OCR text recognition for React Native, basically the same as react-native-mlkit-ocr, but with a few key differences:

• On iOS it is possible to use the built-in Vision framework instead of Google MLKit
• Uses Expo Modules architecture (it's JSI by default)
• A few minor tweaks, e.g. detectFromUri() and detectFromFile() are joined together - proper implementation is detected automatically