Fetch subtitles that have been hoisted out by the media pipeline
Asset subtitle response
Unauthorized response
Not Found response
{"_type": "asset_subtitle","id": "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa","subtitle_tracks": ["https://frameio-app.com/subtitle_track/3gsa-3456aa","https://frameio-app.com/subtitle_track/fms2-amfng4"]}