fix(playground): add Xcode 15.3 compliance workaround on Podfile.

See issue & resolution on React Native project repo:
facebook/react-native#43335

playground/ios/Podfile

@@ -38,7 +38,10 @@ def all_pods
 end
 
 post_install do |installer|
+  __apply_Xcode_15_3_flipper_post_install_workaround(installer)
+
   react_native_post_install(installer, "../../node_modules/react-native", :mac_catalyst_enabled => false)
+
   __apply_Xcode_12_5_M1_post_install_workaround(installer)
 
   # This is to resolve "'shared_timed_mutex' is unavailable: introduced in iOS 10.0" error
@@ -49,6 +52,21 @@ post_install do |installer|
   end
 end
 
+def __apply_Xcode_15_3_flipper_post_install_workaround(installer)
+  installer.pods_project.targets.each do |target|
+    if target.name == 'Flipper'
+      file_path = 'Pods/Flipper/xplat/Flipper/FlipperTransportTypes.h'
+      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
+end
+
 target 'playground' do
   all_pods
 end