Multiphase Hybrid - FY24 Q2 milestone (sharpening the pressure field)

[mbkuhn]

Summary

This PR enables the pressure field from Nalu-Wind to be modified according to the sharpening of the interface via terms applied to the pressure gradient.

Pull request type

Please check the type of change introduced:

• [ ] Bugfix
• [x] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

Checklist

The following is included:

• [x] new unit-test(s)
• [ ] new regression test(s)
• [ ] documentation for new capability

This PR was tested by running:

• the unit tests
  • [ ] on GPU
  • [x] on CPU
• the regression tests
  • [ ] on GPU
  • [ ] on CPU

Additional background

This should be accompanied with new unit tests; the reg tests will be in the exawind-driver repo. More checking and refinement to come; I wanted to put it out there. To follow the merging of #1065