Introducing 'mix' versions

[MichaelSt98]

Fortran driver + OpenMP/OpenACC offload + CUDA/HIP/SYCL kernel implementation

For now only SCC-K-CACHING.

./cloudsc-bundle build --with-mix --cloudsc-gpu-offload ACC|OMP --cloudsc-gpu-lang CUDA|HIP|SYCL

e.g.:

./cloudsc-bundle build --arch=arch/ecmwf/hpc2020/nvhpc/22.11 --with-mix --cloudsc-gpu-offload ACC --cloudsc-gpu-lang CUDA

• Tested on NVIDIA:
  • OpenACC + CUDA
  • OpenMP + CUDA
  • OpenACC + SYCL
  • OpenMP + SYCL
• Tested on AMD:
  • OpenACC + HIP
  • OpenMP + HIP