Add a toggle to change tv provider

[mikeyounge]

First off, love the service. Makes managing media requests so easy. I have come to understand that Overseerr utilizes the TMDb database for its tv shows. Sonarr utilizes TVDB and Plex has the option to use TVDB to sort episodes. This causes issues with episodes being recognized by Overseerr. For example, Mythbusters organizes their seasons by year on TVDB, so Sonarr classifies them that way. Overseerr then shows that nothing is available because Season 1-16 doesn't exist, only 2003-2018. Some seasons/episodes of shows aren't even available. The Grand Tour, for example, had their send-off episode in Season 6, but the TMDb doesn't have a Season 6 listed at all. Is there a reason why we wouldn't want to use the same source as Sonarr for consistency? Or provide a toggle so users can make their own choice based on preference, like Plex does?