feat(captions): export subtitles as separate SRT/VTT file alongside video#599

mvanhorn wants to merge 2 commits into

webadderallorg:mainwebadderallorg/Recordly:mainfrom

mvanhorn:fix/334-recordly-subtitle-file-exportmvanhorn/Recordly:fix/334-recordly-subtitle-file-exportCopy head branch name to clipboard