[Contrib][ONNX] Handle removal of onnx.utils.polish_model #9178
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Onnx 1.9 removed optimizers from the core repository (see discussion
in onnx/onnx#2834), including
onnx.utils.polish_model, breaking RelayToONNXConverter. This PR add
onnxoptimizer.optimize as a fallback method if onnx.utils.polish_model
is unavailable.
Also updates tutorials/documentation to recommend installing
onnxoptimizer when installing onnx, because the current PyPI version
of onnx is above version 1.9.