feat: update example app

[kacperkapusciak]

Description

Example app was sidelined for a long time and it needed a major overhaul.

Changes

• Updated dependencies
• Added Typescript
• Rewritten examples with modern 16.8+ React syntax
• Added interactive playgrounds

Video of one of the playgrounds:

Screen.Recording.2021-03-02.at.12.44.04.mov

Test code and steps to reproduce

cd Example/
yarn                              # install required packages
cd ios/ && pod install  && cd ..  # install pods
yarn start                        # start metro and leave it running

# open new terminal window
cd Example/
npx react-native run-ios      # start iOS simulator
npx react-native run-android  # start Android emulator

Checklist

• Included code example that can be used to test this change
• Ensured that CI passes

[WoLewicki]

Looks better and better every time! I spotted some problems:

• Seems like the rtl on Android is not working.
• We need to pass StatusBar.setTranslucent(true) or use https://github.com/software-mansion/react-native-screens#topinsetenabled-android-only to make Android header acquire proper height.