[video_player] Improve seek performance on Android (#11810) Adds `backBufferDurationMs` to `VideoPlayerOptions` and configures ExoPlayer's `DefaultLoadControl` to retain the back buffer from keyframes. This significantly improves seek performance and responsiveness during video playback on Android. iOS already has some kind of back buffering implemented in AVPlayer because the replays and seeks are instantaneous for small videos. Before: Replays and seeks on Android for network based video assets involve a network call to fetch the video content. This significantly hampers the user experience. After: Replays and seeks on Android (within the back buffer duration) are instant just like in iOS. Improving user experience This PR partly addresses https://github.com/flutter/flutter/issues/97428. Not enabling back buffering by default and instead allowing the app to configure as per need. The default behavior will be same as the existing implementation to avoid any regressions. ## Pre-Review Checklist
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