[eigen] Using SparseLU to calculate the determinant.

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Decided to email this since SparseLU is in 3.2.0-beta1. 

Currently, calculating the determinant of a sparse matrix can be achieved using the SparseCholesky module. Is there a plan to extend this functionality to the SparseLU module? Not sure how trivial this is since I have not looked into the specifics of the implementation and how the factorisation is stored.


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