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This adds coremltools support for split_copy, the copy variant of split. Many view ops in coremltools already register the copy variant as an alias, e.g.,
view: https://github.com/apple/coremltools/blob/main/coremltools/converters/mil/frontend/torch/ops.py#L2316
permute: https://github.com/apple/coremltools/blob/main/coremltools/converters/mil/frontend/torch/ops.py#L1011
But it looks like for split this was missed.
Similar PR for transpose_copy: #2556