feat: add lu_unpack function in Torch Frontend #27062
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PR Description
The lu_unpack function is limited to scipy, torch and paddle. As there are no backend functions implemented yet in Experimental API, I have written a custom and generic unpack for the 2D LU matrix along with the conversion of pivot indices to permutation matrix.
The multi-dimensional lu_unpack is a bit more complex and cluttered in the front-end function. It's better if it is implemented in the Experimental API.
Things to highlight:
torch.lu_unpack()
Related Issue
Closes #26225
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