Add perchannel QDQ

[a-ignatyev]

[a-ignatyev]

What if the version of torch < 1.8?

A user will get the following error: ValueError: Unsupported ONNX opset version: 13

[vshampor]

@a-ignatyev @aleksei-kashapov I modifed this behavior to (hopefully) correctly work for both PT<1.8.0 and PT >1.8.0 cases, tell me what you think about it. TBD: tests

[vshampor]

I am moving this back to the draft state - we cannot merge it yet because opset 13 is not properly supported by the Model Optimizer and even the FP32 models exported to ONNX opset 13 will fail when imported to OpenVINO, which breaks our E2E. Will have to wait until MO starts supporting opset 13.

[openvino-ci]

Can one of the admins verify this patch?

[vshampor]

Obsoleted by another PR.