Bring in SE dycore's grid interpolation (interp_mod.F90) functionality once history is enabled.

### What is the feature/what would you like to discuss?

In CAM the SE dycore can interpolate output history variables from its unstructured grid to a specified lat/lon grid at runtime, using the methods defined in `interp_mod.F90`. This functionality and source code file are currently missing from CAM-SIMA. However, once the new history infrastructure (issue #29) is brought into CAM-SIMA then it would be good to bring this interpolation functionality into the model as well.

Alternatively, it might be worth creating a more dycore-independent interpolation method, possibly using tools from ESMF. However this would almost certainly take more development work than just porting over the dycore-specific implementation in CAM.

### Is there anyone in particular you want to be part of this conversation?

_No response_

### Will this change (regression test) answers?

No

### Will you be implementing this enhancement yourself?

Any Software Engineer can do this