[video_player_platform_interface] Add preventsDisplaySleepDuringVideoPlayback option

[shrabanti722]

Description

Adds the preventsDisplaySleepDuringVideoPlayback field to VideoPlayerOptions and a setPreventsDisplaySleepDuringVideoPlayback method to VideoPlayerPlatform, allowing platform implementations to control whether the display sleeps during video playback.

Platform interface breakout PR for #11225.

Changes

• Adds preventsDisplaySleepDuringVideoPlayback field to VideoPlayerOptions (defaults to true to preserve existing behavior).
• Adds setPreventsDisplaySleepDuringVideoPlayback(int playerId, bool preventsDisplaySleepDuringVideoPlayback) method to VideoPlayerPlatform with a default no-op implementation so existing platform implementations continue to compile without changes.
• Updates CHANGELOG (6.7.0) and pubspec version.
• Adds unit test covering the default value of preventsDisplaySleepDuringVideoPlayback.

Related

• Parent PR: [video_player] Implement screen auto-lock control for video playback #11225
• Fixes: [video_player] Allow screen auto-lock during video playback on iOS flutter#183520

[gemini-code-assist]

Code Review

This pull request updates the video_player_platform_interface to version 6.7.0, adding preventsDisplaySleepDuringVideoPlayback to VideoPlayerOptions and a corresponding method to VideoPlayerPlatform. Review feedback suggests restoring a removed CHANGELOG entry regarding SDK versions and ensuring the new interface method throws an UnimplementedError for consistency with existing methods.

[gemini-code-assist]

The previous entry regarding the minimum supported SDK version update (Flutter 3.35/Dart 3.9) was removed. It should be preserved in the 6.7.0 section along with the new changes to maintain a complete history of changes.

Suggested change

	* Adds `preventsDisplaySleepDuringVideoPlayback` to `VideoPlayerOptions` and
	`setPreventsDisplaySleepDuringVideoPlayback` to `VideoPlayerPlatform`.
	* Adds `preventsDisplaySleepDuringVideoPlayback` to `VideoPlayerOptions` and
	`setPreventsDisplaySleepDuringVideoPlayback` to `VideoPlayerPlatform`.
	* Updates minimum supported SDK version to Flutter 3.35/Dart 3.9.

[gemini-code-assist]

For consistency with other methods in this class (such as setMixWithOthers, setAllowBackgroundPlayback, and setWebOptions), this method should throw an UnimplementedError instead of returning a no-op Future. This ensures that platform implementations are explicitly notified if they haven't implemented the method when it's called, rather than failing silently.

Suggested change

	Future<void> setPreventsDisplaySleepDuringVideoPlayback(
	int playerId,
	bool preventsDisplaySleepDuringVideoPlayback,
	) {
	return Future<void>.value();
	}
	Future<void> setPreventsDisplaySleepDuringVideoPlayback(
	int playerId,
	bool preventsDisplaySleepDuringVideoPlayback,
	) {
	throw UnimplementedError(
	'setPreventsDisplaySleepDuringVideoPlayback() has not been implemented.',
	);
	}