Refactor track ID handling

[semohr]

This pull request refactors and unifies the handling of track and playlist identifiers.

The main change is the introduction of a new ids.py module, which provides standardized, immutable classes for track and playlist IDs, replacing the previous ad-hoc dictionary-based approach.

The collection matching protocols and their usage are also updated to use these new ID classes, simplifying and clarifying the matching logic. Several classes and methods are updated or removed to reflect this new, unified identifier system.

TODOs:

• Test id matching/extraction for each id class
• Changelog
• Examples

[github-actions]

Thank you for the PR! The changelog has not been updated, so here is a friendly reminder to check if you need to add an entry.

[codecov]

Codecov Report

❌ Patch coverage is 75.13369% with 93 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
plistsync/services/tidal/library.py	23.80%	16 Missing ⚠️
plistsync/services/spotify/library.py	26.31%	14 Missing ⚠️
plistsync/services/beets/track.py	66.66%	11 Missing and 1 partial ⚠️
plistsync/services/beets/collection.py	35.29%	11 Missing ⚠️
plistsync/services/plex/library.py	52.17%	10 Missing and 1 partial ⚠️
plistsync/core/collection.py	66.66%	4 Missing and 4 partials ⚠️
plistsync/core/track.py	84.61%	3 Missing and 1 partial ⚠️
plistsync/services/local/track.py	73.33%	3 Missing and 1 partial ⚠️
plistsync/services/spotify/track.py	90.00%	3 Missing ⚠️
plistsync/services/tidal/track.py	90.00%	3 Missing ⚠️
... and 5 more

📢 Thoughts on this report? Let us know!

[semohr]

@pSpitzner Just added a changelog entry and fixed the examples. Please have another look 🙃