feat(ytmusic): Add support for YouTube Music mood filters

[Buroni]

Fixes #297

Proposed changes

• Add filters property and applyFilter method to ytmusic.HomeFeed, which allows results to be filtered by mood.

Testing

import { Innertube } from "youtubei.js";

const yt = await Innertube.create();

const home = await yt.music.getHomeFeed();

console.log(home.filters); // [ 'Workout', 'Relax', 'Energize', 'Commute', 'Focus' ]

console.log(await home.applyFilter('Relax')); // instance of `HomeFeed`

Notes

HomeFeed.applyFilter is almost exactly the same as Search.applyFilter. I'd like to avoid this code duplication by using an inherited base class in the ytmusic classes. I think this would also provide some structure to the classes in this directory, as they implement the same kinds of methods e.g. has_continuation, getContinuation, applyFilter, filters... However I didn't want to make an invasive change without discussion.

[LuanRT]

HomeFeed.applyFilter is almost exactly the same as Search.applyFilter. I'd like to avoid this code duplication by using an inherited base class in the ytmusic classes. I think this would also provide some structure to the classes in this directory, as they implement the same kinds of methods e.g. has_continuation, getContinuation, applyFilter, filters... However I didn't want to make an invasive change without discussion.

This sounds great. But maybe it should be done in a separate PR? Also, there's already a class that does that for YouTube feeds (https://github.com/LuanRT/YouTube.js/blob/main/src/core/mixins/FilterableFeed.ts). But we don't use it for YouTube Music because there are a few differences that we'd have to account for.

[Buroni]

@LuanRT Yep agreed it should be in a separate PR!