fix: add support for react-native 0.68

[tido64]

Description

• react-native 0.68 discussion: Road to 0.68 reactwg/react-native-releases#13
• react-native 0.68 (part 2) discussion: Road to 0.68 - part 2 reactwg/react-native-releases#17
• react-native-windows 0.68: 0.68 Release Status react-native-windows#9486

Blocked by

• fix(android): add compat layer for ReactInstanceEventListener #759
• feat(windows): add signing capability #762
• fix(windows): fix wrong preprocessor check #838
• fix(windows): fix duplicate NuGet packages when on 0.68+ #837

Platforms affected

• Android
• iOS
• macOS
• Windows

Test plan

1. Set version 0.68:

   npm run set-react-version 0.68
   yarn
   cd example
   

2. Build and run Android app:

   yarn android
   

3. Build and run iOS app:

   rm -rf ios/Podfile.lock ios/Pods
   pod install --project-directory=ios
   yarn ios
   

4. Enable Hermes by applying the patch below, and repeat step 3:

   diff --git a/example/ios/Podfile b/example/ios/Podfile
   index b6eae97..3d4a840 100644
   --- a/example/ios/Podfile
   +++ b/example/ios/Podfile
   @@ -4,7 +4,7 @@ workspace 'Example.xcworkspace'
   
    use_flipper! false if ENV['DISABLE_FLIPPER']
   
   -use_test_app! :hermes_enabled => false do |target|
   +use_test_app! :hermes_enabled => true do |target|
      target.tests do
        pod 'Example-Tests', :path => '..'
      end

5. Build and run Windows app:

   yarn install-windows-test-app
   yarn windows
   

Screen	Android (Hermes)	iOS (JSC)	iOS (Hermes)	Windows
Home				n/a
App

[tido64]

Last tested against:

{
  '@react-native-community/cli': '^7.0.3',
  '@react-native-community/cli-platform-android': '^7.0.1',
  '@react-native-community/cli-platform-ios': '^7.0.1',
  'hermes-engine': '~0.11.0',
  'metro-react-native-babel-preset': '0.67.0',
  react: '17.0.2',
  'react-native': '0.68.0-rc.4',
  'react-native-macos': undefined,
  'react-native-windows': '0.68.0-preview.7'
}