Add AudioMetaData.__str__ override

[majabojarska]

Makes AudioMetaData print-friendly.
Closes #1323

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[mthrok]

@majabojarska

Thanks opening the PR. Could you try removing the access to self.__class__ attribute?

[mthrok]

Although this is correct and more generic, TorchScript compiler has restriction in the kind of attributes it can access, and self.__class__ is not accessible. Can you hard-code it?

[majabojarska]

Thanks for the tip. I commited the necessary change.

[mthrok]

Thanks!