Handle 'JUNK' chunks when reading in wave files

I was trying to use this module to read in [this wave file](https://freesound.org/people/straget/sounds/424141/) and was having some trouble.

It looks like before the "fmt" chunk, it's possible to have a chunk that begins with "JUNK" that should be skipped.

I believe it's described in this page talking about the "RIFF" format: https://www.daubnet.com/en/file-format-riff
The fix would go around here: https://github.com/DylanMeeus/GoAudio/blob/master/wave/reader.go#L60

Tangentially, there was a similar issue on the tensorflow project: https://github.com/tensorflow/tensorflow/issues/26247