Fix: Update tvdb to use v4 api and accept absolute episode number

[asfixia]

This PR updates mnamer’s TVDB integration to use the v4 API, since the old API is deprecated and will be dropped soon.

Key changes:

• Migrated requests to the TVDB v4 API.
• Added support for absolute episode numbers → these can now be translated into the standard Season x Episode format.
• No API key is included in this PR, so CI tests that require authentication may fail until a valid key is configured.
• Improve subtitles matching.
• Allows methods different from move, added the parameter: --relocation-operation=(copy | copy-with-metadata | move | hardlink | symlink )
• Allows series absolute numering matching when no reasonable season numer is defined.

Notes:

• The TVDB website indicates the v2 API is deprecated. Updating now ensures future compatibility.
• Please confirm if adopting v4 is the desired direction.

PS: I replaced with my own TVDB key API on code so it can works with tvdb API v4.