Add OMPGPU support (sync only for now) #193

Job	Run time
build-and-test (ubuntu-latest, acc)	12m 58s
build-and-test (ubuntu-latest, acc)	12m 58s
build-and-test (ubuntu-latest, acc)	12m 58s
build-and-test (ubuntu-latest, ompgpu)	13m 42s
build-and-test (ubuntu-latest, ompgpu)	13m 42s
build-and-test (ubuntu-latest, ompgpu)	13m 42s
build-and-test (macos-latest, acc)	7m 2s
build-and-test (macos-latest, acc)	7m 2s
build-and-test (macos-latest, acc)	7m 2s
build-and-test (macos-latest, ompgpu)	6m 57s
build-and-test (macos-latest, ompgpu)	6m 57s
build-and-test (macos-latest, ompgpu)	6m 57s
build-and-test (linux-gpu-cuda, acc)	8m 42s
build-and-test (linux-gpu-cuda, acc)	1s
build-and-test (linux-gpu-cuda, acc)	8m 42s
build-and-test (linux-gpu-cuda, ompgpu)	11m 55s
build-and-test (linux-gpu-cuda, ompgpu)	11m 55s
build-and-test (linux-gpu-cuda, ompgpu)	11m 55s
	2h 55m 7s

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