Bring in Ruiz scaling implementation - #1
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Ruiz equilibration is an iterative matrix scaling algorithm commonly used in numerical linear algebra to equilibrate the rows and columns of a matrix (typically making the maximum absolute value of each row and column close to 1). This is often used as a preprocessing step to improve the numerical stability and conditioning of matrices before solving linear systems, computing eigenvalues, or performing other matrix decompositions.
This PR implements Ruiz scaling on the host and GPU as part of the csr_matrix class.