Add video generation

[gena]

• [ ] Add generate video button
• [ ] Add region selection functionality (draw rectangle or point or current screen ...)
• [ ] Specify extra parameters (time step, interval, fps, resolution, etc.)

Prototype: https://code.earthengine.google.com/?scriptPath=users%2Fgena%2Faqua-monitor%3Aissue-49-video-generation.js

[gena]

Also check functionality in other applications, e.g. https://apps.sentinel-hub.com/eo-browser ...