Implement global packet caching for the new media tags

[samohovets]

http range requests are unreliable for browser caching – very unpredictable behaviour + if user has scrubbed through the whole file, it doesn't cache the whole file

so people who build with Remotion are basically forced to implement some local asset caching (opfs / indexed db / whatever)

on low connections, multiple <Video> is a terrible scene: clips are fighting for the download bandwidth, starting multiple range requests with non-cacheable headers and so on

Solution:

seems like UrlSource is a 300 line implementation, we could try to experiment in userland first, and if it is good, contribute it back