abisner

Create `interpolation_fused_p2g2p` example

1

Another example dedicated to kernel fusion of chained `p2g` and `g2p` operations using the thread-level interfaces should be added.

Add HIP support for HYPRE

5

~Added FindHYPRE cmake for autotools install in lieu of available CMake installation.~ Uses pkgconfig instead in lieu of available CMake installation

- [ ] Remove boilerplate workarounds for fold expressions. - [ ] `KOKKOS_CLASS_LAMBDA` for member variable captures. - [ ] `if constexpr` - [ ] Remove associated `TODO`'s.

Adds missing host mirror copy. Closes #745.