Add initial version of the Listenbrainz plugin

[arsaboo]

Description

Fixes #1719

I added a basic version of the LB plugin that imports the play history. It uses the same process used in the Lastimport plugin to update playcounts.

There are few additional functions that I added here to import playlists created by Listenbrainz. These playlists can then be imported in other programs such as Plex.

To Do

• Documentation. (If you've added a new command-line flag, for example, find the appropriate page under docs/ to describe it.)
• Changelog. (Add an entry to docs/changelog.rst to the bottom of one of the lists near the top of the document.)

[sampsyo]

Awesome! This already looks fantastic! No objection to merging right away if you think this is at a usable initial state.

I also noticed this contains a few changes to the last.fm plugin. Was that intentional? I didn't review them carefully, although they seem credible. If they fix bugs in the plugin, maybe that deserves a changelog entry of its own.

[arsaboo]

@sampsyo Yes, I have tested it, and it is ready to be merged.

I made minor changes to the process_tracks function in lastimport to improve error handling and reuse the same function. I am not entirely happy with the process_tracks function as it does a poor job of matching (e.g., right now, it only matches 3 of the 25 tracks even though they are all in my library). It may be due to the fact that I am using Spotify as the tag source. I do want to create a better matching function, but that can be done in a separate PR.

[sampsyo]

Sounds good! Would you mind summarizing the changes to lastimport in their own changelog entry? Then this is clearly good to go!

[Kernald]

Correct me if I'm wrong, but this seems to be fetching the whole ListenBrainz history on each run - could we leverage min_ts somehow to avoid that maybe?

[arsaboo]

Yes, all the elements could (and should) be configured. We still need to carefully think about how to use them (which is why I called this PR initial version 😉). I honestly don't use the play_count information, but I am sure someone will find it useful and update the code to use those variables (heck, even I may do it at some point if no one gets to it).

The current code has been reviewed and approved by @sampsyo, so I would not change it. Once this PR is merged, we can create a feature request for additional configurations and discuss the best approach to implement the same.

[Serene-Arc]

I'll merge this then, since it's been approved. I should note that I have attempted my own tool for listenbrainz here, though it is implemented in Rust instead of Python. I still have to reach out to the listenbrainz team to try and get the song matching working as well as it can. Right now I can get it to about 90%+ but still not 100%.

[arsaboo]

@Serene-Arc I will try to extend this plugin to include playlist uploads. The song-matching issue could be on LB's end...see a related issue.