Feat: add a new lyrics source Musixmatch

[Golevka2001]

The implementation references the LyricsPlus.

I've tested it with some songs and the results are as follows:

Instrumental music, return empty lyric object:

Of course I've updated LyricsX as well, so if you agree to merge this PR, I'll update LyricsX to fit it later. I'll test more and try to make sure there are no errors

[Golevka2001]

You can directly test it like this:

@Test
func musixmatchProvider() async throws {
    try await test(provider: LyricsProviders.Musixmatch(usertoken: "your_token_here"))
}

The token can be obtained as described here, or by using the token in their example:

200501593b603a3fdc5c9b4a696389f6589dd988e5a1cf02dfdce1