docs: Add Kotlin & Swift FP plugins examples (#1902)

* chore(docs): add Kotlin FP example

* chore(docs): add Swift FP plugin

package/example/ios/Podfile

@@ -5,6 +5,8 @@ require Pod::Executable.execute_command('node', ['-p',
     {paths: [process.argv[1]]},
   )', __dir__]).strip
 
+require_relative './vc_example_cocoapod_utils.rb'
+
 platform :ios, min_ios_version_supported
 prepare_react_native_project!
 
@@ -46,5 +48,8 @@ target 'VisionCameraExample' do
       :mac_catalyst_enabled => false
     )
     __apply_Xcode_12_5_M1_post_install_workaround(installer)
+
+    # Define "VISION_CAMERA_ENABLE_FRAME_PROCESSORS" Swift compiler flag if frame processor are enabled
+    set_frame_processor_swift_flag_in_example_project(installer)
   end
 end