builtins: Support batched initialize_function #5757

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	53m 8s
pytest-ubuntu-py311-gcc11-noomp-adjoint	54m 19s
pytest-ubuntu-py38-gcc12-omp-base	56m 29s
pytest-ubuntu-py38-gcc12-omp-adjoint	51m 38s
pytest-ubuntu-py37-gcc7-omp-base	1h 11m 33s
pytest-ubuntu-py37-gcc7-omp-adjoint	1h 15m 49s
pytest-ubuntu-py310-gcc10-noomp-base	57m 27s
pytest-ubuntu-py310-gcc10-noomp-adjoint	52m 24s
pytest-ubuntu-py38-gcc8-omp-base	1h 15m 49s
pytest-ubuntu-py38-gcc8-omp-adjoint	59m 44s
pytest-ubuntu-py39-gcc9-omp-base	1h 6m 21s
pytest-ubuntu-py39-gcc9-omp-adjoint	51m 27s
pytest-osx-py37-clang-omp-base	5m 2s
pytest-docker-py39-gcc-omp-base	1h 15m 21s
pytest-docker-py39-gcc-omp-adjoint	49m 5s
pytest-docker-py39-icx-omp-base	51m 30s
pytest-docker-py39-icx-omp-adjoint	53m 56s
	16h 1m 2s

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