Type stable path to construct SimpleGMRES

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (3b4f4ed) 65.02% compared to head (593cd43) 65.07%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #450 +/- ## ========================================== + Coverage 65.02% 65.07% +0.04% ========================================== Files 27 27 Lines 2110 2113 +3 ========================================== + Hits 1372 1375 +3 Misses 738 738 ```

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