api: support custom coeffs for div/grad/curl #7150

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	50m 1s
pytest-ubuntu-py311-gcc11-noomp-adjoint	39m 0s
pytest-ubuntu-py312-gcc12-omp-base	1h 7m 41s
pytest-ubuntu-py312-gcc12-omp-adjoint	50m 40s
pytest-ubuntu-py39-gcc7-omp-base	53m 4s
pytest-ubuntu-py39-gcc7-omp-adjoint	40m 4s
pytest-ubuntu-py310-gcc10-noomp-base	50m 40s
pytest-ubuntu-py310-gcc10-noomp-adjoint	39m 14s
pytest-ubuntu-py312-gcc13-omp-base	1h 6m 56s
pytest-ubuntu-py312-gcc13-omp-adjoint	50m 46s
pytest-ubuntu-py39-gcc9-omp-base	53m 23s
pytest-ubuntu-py39-gcc9-omp-adjoint	41m 4s
pytest-osx-py312-clang-omp-base	37m 52s
pytest-docker-py39-gcc-omp-base	46m 21s
pytest-docker-py39-gcc-omp-adjoint	36m 12s
pytest-docker-py39-icx-omp-base	37m 53s
pytest-docker-py39-icx-omp-adjoint	35m 12s
	13h 16m 3s

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