[Relay][Frontend][Onnx] Enable group_conv1d import through conv2d conversion. #8321
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TVM doesn't support
group_conv1d
currently and adding it formally is a non-trivial amount of work. Meanwhile, we're encountering an increasing number of models that use it. As an interim solution, we can importgroup_conv1d
usinggroup_conv2d
by simply adding a new spatial axis with size 1. This PR adds that converter into the onnx frontend along with corresponding tests.