Currently, Split operator splits the tensor to equal sized tensors if split input is not given.

I think this restriction is not very important. For example, pytorch's split also supports the case when dim cannot be evenly split. https://pytorch.org/docs/1.12/generated/torch.split.html?highlight=split#torch.split

UPD: Torch's corresponding function was https://pytorch.org/docs/stable/generated/torch.tensor_split.html

Can we update the operator definition to support this case?