Add method to fetch lyrics from specific track

Hi, please add method to fetch lyrics from specific track and return array of [track.parseEvent()](https://grimmdude.com/MidiPlayerJS/docs/track.js.html#line185)

Expect output:
```
[
  { track, delta, tick, byteIndex, "name": "Lyric", string },
  { track, delta, tick, byteIndex, "name": "Lyric", string },
  { ... },
]
```