Ankit/add videodb editor

[ankit-v2-3]

Pull Request

Description:
Add new programmable video editor.

Core Concepts

1. Timeline: The main canvas. This represents final video file. It has a global resolution and background color.
2. Tracks: The "Layers." Tracks are stacked vertically. A higher track obscures the tracks below it (unless transparent).
3. Clips: The "Containers." A Clip wraps an asset to define when it plays, how long it lasts, and what visual effects apply (like filters or transitions).
4. Assets: The "Raw Media." These point to the source files (Video, Audio, Image) or define raw content (Text, Captions).

The Basic Workflow

1. Initialize a Timeline.
2. Create an Asset (Video, Image, Audio, or Text).
3. Wrap the Asset in a Clip to define duration and effects.
4. Add the Clip to a Track at a specific start time.
5. Add the Track to the Timeline.
6. Generate the stream.