Use Kokkos::Parallel in ResidualGive

[julianlitz]

Merge Request - GuideLine Checklist

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.13%. Comparing base (5952563) to head (d5c13a2).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #242      +/-   ##
==========================================
- Coverage   90.72%   90.13%   -0.59%     
==========================================
  Files          86       80       -6     
  Lines        9473     8878     -595     
==========================================
- Hits         8594     8002     -592     
+ Misses        879      876       -3     

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[EmilyBourne]

As mentioned in a different PR, the use of pointers will prevent this from working on GPU

[julianlitz]

Removing the Grid pointer already works. The data will not be copied.

But doing the same for the LevelCache not quite:
We need to change the LevelCache member to AllocatableVector so no new copies are made.

[EmilyBourne]

We need to change the LevelCache member to AllocatableVector so no new copies are made.

I don't understand why this would be the case.

We do need to remove references from LevelCache though

[julianlitz]

I didn't test it yet. But before merging we just need to be sure that LevelCache isn't fully copied when parsed to a kokkos lambda

[julianlitz]

Moved to #256