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

* chore(docs): add Kotlin FP example

* chore(docs): add Swift FP plugin

package/example/ios/VisionCameraExample/AppDelegate.mm

@@ -1,10 +1,6 @@
 #import "AppDelegate.h"
 
 #import <React/RCTBundleURLProvider.h>
-#import "VisionCameraExample-Swift.h"
-#if VISION_CAMERA_ENABLE_FRAME_PROCESSORS
-#import <VisionCamera/FrameProcessorPlugin.h>
-#endif
 
 @implementation AppDelegate
 
@@ -15,10 +11,6 @@
   // They will be passed down to the ViewController used by React Native.
   self.initialProps = @{};
 
-#if VISION_CAMERA_ENABLE_FRAME_PROCESSORS
-  [FrameProcessorPlugin registerPlugin:[[ExamplePluginSwift alloc] init]];
-#endif
-
   return [super application:application didFinishLaunchingWithOptions:launchOptions];
 }