docs: Update flutter full-screen API and event listeners

[Balamurugan-Testpress]

• Add enterFullScreen() and exitFullScreen() methods
• Document onBeforeFullScreenEnter and onBeforeFullScreenExit callbacks

[gemini-code-assist]

Summary of Changes

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This pull request enhances the Flutter SDK documentation by adding comprehensive guides for new fullscreen functionalities. It provides clear instructions and examples for programmatically entering and exiting fullscreen mode, as well as for utilizing new callbacks to react to fullscreen state transitions. These updates aim to improve the developer experience by offering more control and observability over the player's fullscreen behavior.

Highlights

• Fullscreen API Methods: Added documentation for enterFullScreen() and exitFullScreen() methods, allowing programmatic control over fullscreen mode in the Flutter SDK.
• Fullscreen Event Listeners: Documented onBeforeFullScreenEnter and onBeforeFullScreenExit callbacks, enabling developers to listen for fullscreen state changes.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for the Flutter SDK to include new fullscreen APIs and event listeners. My review focuses on improving the code examples for clarity and consistency with Dart's conventions. I've suggested using null-safe operators for controller access to prevent potential runtime errors and recommended aligning method and property names with the lowerCamelCase convention for better code quality and readability.