sparse goodies (wip, but whatever)

[codecov[bot]]

Codecov Report

Attention: 668 lines in your changes are missing coverage. Please review.

Comparison is base (18d84fe) 92.14% compared to head (52ecbfc) 84.71%.

Files	Patch %	Lines
faer-libs/faer-core/src/matrix_ops.rs	26.26%	320 Missing :warning:
faer-libs/faer-core/src/mul.rs	83.57%	69 Missing :warning:
faer-libs/faer-cholesky/src/llt/update.rs	87.26%	68 Missing :warning:
faer-libs/faer-sparse/src/cholesky.rs	76.71%	61 Missing :warning:
...aer-libs/faer-cholesky/src/ldlt_diagonal/update.rs	88.28%	41 Missing :warning:
faer-libs/faer-evd/src/tridiag_real_evd.rs	45.31%	35 Missing :warning:
faer-libs/faer-qr/src/col_pivoting/compute.rs	96.65%	11 Missing :warning:
faer-libs/faer-qr/src/no_pivoting/compute.rs	87.17%	10 Missing :warning:
faer-libs/faer-core/src/householder.rs	96.87%	7 Missing :warning:
faer-libs/faer-cholesky/src/llt/compute.rs	64.70%	6 Missing :warning:
... and 16 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #85 +/- ## ========================================== - Coverage 92.14% 84.71% -7.44% ========================================== Files 57 60 +3 Lines 66142 76032 +9890 ========================================== + Hits 60946 64409 +3463 - Misses 5196 11623 +6427 ```

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