v1.0.4

feat: Implement FFmpeg progress parsing and session management

- Added FFmpegProgressParser for parsing progress information from FFmpeg output.
- Introduced FFmpegSessionManager to manage active FFmpeg sessions, including state updates and progress tracking.
- Created FFmpegShellExecutor for executing FFmpeg commands via shell to handle permission issues on Android.
- Developed FFmpegTester to test various execution methods for FFmpeg.
- Implemented FFmpegUtils for file handling and utility functions related to FFmpeg operations.
- Added FFmpegWrapper to execute FFmpeg commands using popen() for Android 10+ compatibility.
- Included unit tests for basic functionality verification.