DArray: Add LU, triangular solve, and more#675
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- **Implemented RowMaximum Pivoting**: Added a new LU factorization strategy using the RowMaximum pivoting method for distributed matrices - **Custom Pivot Search and Swapping**: Introduced helper functions for searching row maxima, updating pivot indices, and swapping rows in both panel and trailing submatrices - **Blockwise Distributed Algorithm**: Ensured compatibility with block-partitioned distributed matrices, supporting only equal block sizes for now - **Non-breaking Addition**: Existing NoPivot LU functionality remains unchanged; RowMaximum is an additional strategy selectable via the LinearAlgebra interface.
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Thanks to @AkhilAkkapelli for the implementations! He implemented these a while back, but I had blocked merging them on #662 as they use views in Datadeps (which were broken until that PR).
This also fixes some bugs in Datadeps and improves various bits and pieces of the DArray that LinearAlgebra routines utilize.
Todo:
SingularExceptionin LU testsldiv!ldiv!support to docs