MPI: revamp mpi indexing for full arbitrary indexing support #675

Job	Run time
pytest-docker-py310-gcc-omp-adjoint	23m 56s
pytest-docker-py310-icx-omp-adjoint	24m 16s
pytest-ubuntu-py311-gcc10-noomp-base	35m 29s
pytest-docker-py310-icx-omp-base	37m 36s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	28m 43s
pytest-ubuntu-py313-gcc14-omp-base	45m 40s
pytest-docker-py310-gcc-omp-arm64-adjoint	20m 56s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	28m 20s
pytest-ubuntu-py310-gcc9-omp-base	40m 23s
pytest-ubuntu-py312-gcc13-omp-base	45m 48s
pytest-ubuntu-py311-gcc10-noomp-adjoint	25m 53s
pytest-osx-py312-clang-omp-base	34m 37s
pytest-docker-py310-gcc-omp-base	20m 27s
pytest-docker-py310-gcc-omp-arm64-base	29m 32s
pytest-ubuntu-py312-gcc12-cxxomp-base	49m 32s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	41m 15s
pytest-ubuntu-py310-gcc14-omp-base	42m 10s
pytest-ubuntu-py310-gcc9-omp-adjoint	27m 4s
pytest-ubuntu-py310-gcc14-omp-adjoint	27m 10s
pytest-ubuntu-py313-gcc14-omp-adjoint	27m 28s
pytest-ubuntu-py312-gcc13-omp-adjoint	28m 53s
	11h 25m 8s

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