aten::einsum(str equation, Tensor[] tensors) -> (Tensor)

[Scikud]

Would be super useful to add support for einops and in particular einusm

[github-actions]

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[narendasan]

https://docs.nvidia.com/deeplearning/tensorrt/api/c_api/classnvinfer1_1_1_i_einsum_layer.html

[narendasan]

cc: @gs-olive