[TorchToLinalg] Support lowering AtenMaxUnpool2dOp for linalg backend #4265
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The change adds support to lower AtenMaxUnpool2dOp for linalg backend. Existing lowering for AtenMaxUnpool3dOp is refactored such that 2d/3d variants share utils
Unlike max_unpool3d, max_unpool2d does not support specification of stride, padding
torch op registry
The default values of stride and padding
https://docs.pytorch.org/docs/stable/generated/torch.nn.MaxUnpool2d.html
Closes #4255