Improve LRC parse handling

[taoky]

This modifies lrc_iter() in lyric/utils.rs:

• After discussing with @poly000, it shows that moving trimming logic from Lyric into_owned() to here is a better idea.
• Sort lyrics by their timestamp after collecting lyrics vector. This helps handling LRC files with timestamp in malformed order.
  • An example [00:39.42]ずっと考えてでも\n[00:28.77]\n[00:31.19]

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