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Summary:
This commit adds a new feature AudioEffector, which can be used to
apply various effects and codecs to waveforms in Tensor.

Under the hood it uses StreamWriter and StreamReader to apply
filters and encode/decode.

This is going to replace the deprecated `apply_codec` and
`apply_sox_effect_tensor` functions.

It can also perform online, chunk-by-chunk filtering.

Tutorial to follow.

closes https://github.com/pytorch/audio/issues/3161

Pull Request resolved: https://github.com/pytorch/audio/pull/3163

Reviewed By: hwangjeff

Differential Revision: D44576660

Pulled By: mthrok

fbshipit-source-id: 2c5cc87082ab431315d29d56d6ac9efaf4cf7aeb