ffprobe: Add missing stream disposition, Enable use of any tag and fix optional attributes (#50494)
ffprobe: Add missing stream disposition, Enable use of any tag and fix optional attributes (#50494)

* ffprobe: Add "timed_thumbnails" to disposition

* ffprobe: Make attributes of tag string/undefined

* Make timed_thumbnails optional

* ffprobe: Base optional params on FFmpeg source
georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped