tests: Overhaul GPU testing, and test linalg operations on GPUs #635
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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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This should help us establish a baseline for which linear algebra operations actually work on the GPU. It also conveniently sets up infrastructure for testing different kinds of CPU-only scenarios, which should help shake out any generic bugs.