Apple: Prepare for the migration away from CocoaPods

[tido64]

React Native is migrating away from CocoaPods. We currently have a lot of Ruby code that are invoked via CocoaPods. This task is to port any independent scripts to JS and eventually hook into a hypothetical prebuild step. Any change we make must be backwards compatible.

• ios/assets_catalog.rb → refactor(apple): port some CocoaPods scripts to JS #2412
• ios/entitlements.rb → refactor(apple): port 'entitlements.rb' to JS #2420
• ios/info_plist.rb → refactor(apple): port info_plist.rb to JS #2421
• ios/node.rb → fix(apple): use JS-based Xcode project generator #2427
• ios/pod_helpers.rb
  • refactor(apple): port make_project! to JS #2422
  • refactor(apple): evaluate Hermes from JS #2435
• ios/privacy_manifest.rb → refactor(apple): port 'privacy_manifest.rb' to JS #2419
• ios/test_app.rb
  • refactor(apple): port make_project! to JS #2422
  • fix(apple): use JS-based Xcode project generator #2427
  • refactor(apple): implement simple pbxproj parser #2442
  • fix(apple): fix ENOBUFS when reading/writing plists #2443
• ios/use_react_native-0.70.rb
• ios/use_react_native-0.71.rb
• ios/xcode.rb → refactor(apple): port some CocoaPods scripts to JS #2412
• test/test_node.rb → fix(apple): use JS-based Xcode project generator #2427
• test/test_pod_helpers.rb
  • refactor(apple): port make_project! to JS #2422
  • refactor(apple): evaluate Hermes from JS #2435
• test/test_test_app.rb → test: add tests for the JS-based Xcode project generator #2425
• test/test_xcode.rb → refactor(apple): port some CocoaPods scripts to JS #2412

[tido64]

Closing this issue since we've ported everything that can be ported at this point. Postinstall cannot be ported because CocoaPods has not serialized anything to disk yet when the postinstall hook is called. Nonetheless, the code for it may be useful for the next solution and can be found here: https://github.com/microsoft/react-native-test-app/pull/new/tido/apple/postinstall