[FEAT] Rework DaffMediaGalleryComponent to support videos

[xelaint]

💡 Feature request

Feature Name

Rework DaffMediaGalleryComponent to support videos

The Desired Behavior

The thumbnails in the media gallery should be smaller versions of the main image, and if it's a video, it should show a small image of a video (not the video itself) in the thumbnail. The current implementation ends up displaying the actual videos in the thumbnail, which is not what we want.

Your Use Case

Prior Work

Environment

Daffodil version: X.Y.Z
Angular version: X.Y.Z 

 
For Tooling issues:
- Node version: XX  
- Platform:  

Others: