API: Revamp sparse subfunction #6631

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	37m 37s
pytest-ubuntu-py311-gcc11-noomp-adjoint	31m 30s
pytest-ubuntu-py38-gcc12-omp-base	37m 33s
pytest-ubuntu-py38-gcc12-omp-adjoint	31m 46s
pytest-ubuntu-py38-gcc7-omp-base	36m 2s
pytest-ubuntu-py38-gcc7-omp-adjoint	31m 18s
pytest-ubuntu-py310-gcc10-noomp-base	36m 37s
pytest-ubuntu-py310-gcc10-noomp-adjoint	31m 46s
pytest-ubuntu-py312-gcc13-omp-base	48m 29s
pytest-ubuntu-py312-gcc13-omp-adjoint	41m 0s
pytest-ubuntu-py39-gcc9-omp-base	36m 12s
pytest-ubuntu-py39-gcc9-omp-adjoint	31m 4s
pytest-osx-py312-clang-omp-base	1m 32s
pytest-docker-py39-gcc-omp-base	37m 2s
pytest-docker-py39-gcc-omp-adjoint	28m 47s
pytest-docker-py39-icx-omp-base	31m 53s
pytest-docker-py39-icx-omp-adjoint	28m 43s
	9h 18m 51s

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