Add AUDIO for Tensor datatype

[jhj0517]

• Edited Part: https://docs.comfy.org/custom-nodes/backend/datatypes#tensor-datatypes

Added AUDIO for Tensor datatype.

The AUDIO format looks like this:

{"sample_rate": 16000, "waveform": <torch.Tensor>}

It would be helpful to include this in the doc for nodes that involve audio (e.g. TTS nodes)

[christian-byrne]

Thank you!