add new video edit scripts for combine video and spliting video

package/video_editing/__init__.py

@@ -0,0 +1,13 @@
+# package/video_editing/__init__.py
+
+# Expose components from individual modules using relative imports
+from .combine_videos import merge_videos
+from .split_video_by_timestamps import split_video
+from .build_shorts import fit_to_9_16_letterbox
+
+# Explicitly define what is exposed when importing the subpackage
+__all__ = [
+    "merge_videos",
+    "split_video",
+    "fit_to_9_16_letterbox"
+]