Support multiple duplicate anilist ids in custom mappings

[ghost]

Issue: 144

This allows the usage of multiple anilist-ids duplicates with multiple seasons. By allowing this, long series such as fairy tail can have a set of plex seasons match one anilist item and another set match another anilist item.

This configuration is now supported:

seasons:
      - season: 1
        anilist-id: 6702
      - season: 2
        anilist-id: 6702
      - season: 3
        anilist-id: 20626
      - season: 4
        anilist-id: 20626

Testing data:

Results in Anilist:

[ghost]

@reconman Not sure how the process is to get PRs approved to this repository.

Do you know if Rick does anything in this Repo. I'd like to at least updated the docker image since it's been stale for a while now. I'm guessing we would need help from @RickDB

[reconman]

I wanted to test it before merging but didn't have time yet because of Christmas.

[ghost]

All good.
Sorry for intruding on your Christmas.

Btw I think the duplicate variable might not be entirely necessary since I ended up adding the seasons with certain id to the same object, so could check the length of that list instead of the duplicate parameter

[ghost]

Added support for start now and removed the first elif because it actually wasn't doing what we wanted.

If we had a season with 25 episodes and then one season with 50 mapped to the same id. If the second season had more than 25 episodes watched, then anilist would get only those 25+ and never add them together to have 50+ episodes updated for that season.

[nm-remarkable]

This is my account now. Makes it easier to only have one account

[nm-remarkable]

I ask you once again, when you have the time to review these changes 🙏

[reconman]

Closing because I can't edit your PR branch, continuing in #174