Add Pip Support for android and ios

[dhiaspaner]

PR: Feature - Picture-in-Picture (PiP) Support

📝 Description

This Pull Request introduces Picture-in-Picture (PiP) mode to the ComposeMediaPlayer library. This feature allows users to continue watching video content in a floating window while navigating away from the application on mobile devices.

📱 Supported Platforms

Platform	Status	Notes
Android	✅	Fully supported using native Android PiP APIs (requires Android 8.0+).
iOS	✅	Fully supported using AVPictureInPictureController.
Desktop	❌	Not supported (No-op).
Web	❌	Not supported (No-op).

🛠 Implementation Details

Common Code

• Introduced a platform-agnostic interface to handle PiP requests.
• Added logic to gracefully handle PiP triggers on unsupported platforms (no-op).

Android

• Enabled android:supportsPictureInPicture="true" in the manifest.
• Implemented something similar toonUserLeaveHint to automatically enter PiP mode when the user backgrounds the app while video is playing.
• Configured PictureInPictureParams to handle aspect ratio updates dynamically based on the video content.

iOS

• Integrated AVPictureInPictureController with the existing AVPlayer layer.
• Handled the restoration of the user interface when returning from PiP mode.

🧪 How to Test

Android

1. Launch the app and start playing a video.
2. Press the Home button or swipe up to go home.
3. Expectation: The app minimizes into a floating PiP window, and the video continues playing.
4. Tap the PiP window to expand it back to full screen.

iOS

1. Launch the app and start playing a video.
2. Swipe up to go home or tap the PiP toggle button.
3. Expectation: The video detaches into a floating overlay, and playback continues.
4. Lock the screen and verify audio continues playing.

📸 Screenshots / Screen Recordings

(Please attach screenshots or a GIF/video of the PiP transition on Android and iOS here)

⚠️ Notes

• Android: Min SDK is set to 23, but PiP requires API 26+. Checks are in place to ensure safety on older devices.
• iOS: Requires "Audio, AirPlay, and Picture in Picture" to be enabled in the Background Modes capability.