fix gather/scatter type verification

[Joroks]

Computes and Fixes are allways doubles. This is just a small fixup - I think In the future we should use

• LAMMPS_INT
• LAMMPS_INT_2D
• LAMMPS_DOUBLE
• LAMMPS_DOUBLE_2D

for the type parameter instead of Int32 and Float64. This makes the API more consistent and we're able to return Vectors instead of 1xN Matrices while preserving type stability.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.91%. Comparing base (913e7c3) to head (180f973).
Report is 2 commits behind head on main.

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Additional details and impacted files

@@             Coverage Diff             @@
##             main      #57       +/-   ##
===========================================
+ Coverage   54.56%   67.91%   +13.34%     
===========================================
  Files           2        2               
  Lines         449      427       -22     
===========================================
+ Hits          245      290       +45     
+ Misses        204      137       -67     

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