[TEC-2567] Gif optimization

[dinohamzic]

This PR:

• optimizes GIF compression while maintaining quality
• converts GIF in different sizes (before we used the original dimensions for all sizes)
• disallows upscaling of an asset (resize can be lower or equal to original width, never greater)

Before (4MB @ 2160x1000, all sizes the same)	After (2.9MB @ 2160x1000, large retina, other sizes much smaller)