chore: fix flipper pod compilation with pika 15.3 toolchain (#11080)

add pod post install script to include required import 
see more
facebook/flipper@b3dcdb8

facebook/react-native#43335 (comment)

NOTE: to install ios pods run `yarn pod:install`. It will execute `
bundle exec pod install --project-directory=ios` within the project root
directory.
Running  `pod install`  inside `ios` folder will error out

ios/Podfile

@@ -116,11 +116,26 @@ target 'MetaMask-Flask' do
 end
 
 post_install do |installer|
+ # fix flipper with pika 15.3 toolchain
+ installer.pods_project.targets.each do |target|
+ if target.name == 'Flipper'
+ file_path = 'ios/Pods/Flipper/xplat/Flipper/FlipperTransportTypes.h'
+ system("chmod +w " + file_path)
+ contents = File.read(file_path)
+ unless contents.include?('#include <functional>')
+ File.open(file_path, 'w') do |file|
+ file.puts('#include <functional>')
+ file.puts(contents)
+ end
+ end
+ end
+ end
+
  react_native_post_install(
  installer,
  # Set `mac_catalyst_enabled` to `true` in order to apply patches
  # necessary for Mac Catalyst builds
  :mac_catalyst_enabled => false
- ) 
+ )
  __apply_Xcode_12_5_M1_post_install_workaround(installer)
 end

package.json

@@ -7,7 +7,7 @@
  "watch": "./scripts/build.sh watcher watch",
  "watch:clean": "./scripts/build.sh watcher clean",
  "clean:ios": "rm -rf ios/build",
- "pod:install": "command -v pod && (cd ios/ && bundle exec pod install && cd ..) || echo \"Skipping pod install\"",
+ "pod:install": "command -v pod && bundle exec pod install --project-directory=ios || echo \"pod command not found. Skipping pod install\"",
  "clean:ppom": "rm -rf ppom/dist ppom/node_modules app/lib/ppom/ppom.html.js",
  "clean:android": "rm -rf android/app/build",
  "clean:node": "rm -rf node_modules && yarn --frozen-lockfile",