Add seasons to lists in V3 for single-season shows

Add Seasons to Lists in V3 for Shows with a Single Season

Manage lists for a season of a show that only has a single season in V3. This includes miniseries, and also shows that will have multiple seasons but only the first season has been released so far. The previous feature request about adding episodes and seasons to lists was marked "Completed" (https://roadmap.trakt.tv/p/adding-episodes-and-seasons-to-lists-in-v3) by the Trakt team yesterday, but this crucial function is still missing, and more work is to be done so the originally-requested feature is fully completed. However, it is still missing the crucial function of managing lists for a season of a show that only has a single season, so this request is to help ensure that the Trakt team doesn't lose sight of the fact that the originally-requested feature isn't fully completed yet.