Add OS Lyrics extension (#2656)

* draft commit

* time to fight pipeline

* round 2 changes

* remove unnecessary line

* fight taglib. again

* make taglib work again???

* add id3 tags

* taglib 1.12 vs 1.13

* use int instead for windows

* store as json now

* add migration, more tests

* support repeated line, multiline

* fix ms and support .m, .mm, .mmm

* address some concerns, make cpp a bit safer

* separate responses from model

* remove [:]

* Add trace log

* Try to unblock pipeline

* Fix merge errors

* Fix SIGSEGV error (proper handling of empty frames)

* Add fallback artist/title to structured lyrics

* Rename conflicting named vars

* Fix tests

* Do we still need ffmpeg in the pipeline?

* Revert "Do we still need ffmpeg in the pipeline?"

Yes we do.

This reverts commit 87df7f6df79bccee83f48c4b7a8118a7636a5e66.

* Does this passes now, with a newer ffmpeg version?

* Revert "Does this passes now, with a newer ffmpeg version?"

No, it does not :(

This reverts commit 372eb4b0ae05d9ffe98078e9bc4e56a9b2921f32.

* My OCD made me do it :P

---------

Co-authored-by: Deluan Quintão <deluan@navidrome.org>

tests/mock_ffmpeg.go

@@ -19,6 +19,10 @@ type MockFFmpeg struct {
 	Error  error
 }
 
+func (ff *MockFFmpeg) IsAvailable() bool {
+	return true
+}
+
 func (ff *MockFFmpeg) Transcode(context.Context, string, string, int, int) (io.ReadCloser, error) {
 	if ff.Error != nil {
 		return nil, ff.Error