Remove Double Copies from Device to Host and Host to Pointer

[Fuad-HH]

For example, we could directly copy to an unmanaged kokkos view that is created using the pointer:

readOH2csg/src/capi.cpp

Lines 54 to 86 in aa6b922

	// copy edge coefficients to output array
	auto host_edge_coefficients =
	Kokkos::create_mirror_view(edge_coefficients_view);
	Kokkos::deep_copy(host_edge_coefficients, edge_coefficients_view);
	for (int edge = 0; edge < mesh->nedges(); ++edge) {
	for (int i = 0; i < 6; ++i) {
	edge_coefficients[edge * 6 + i] = host_edge_coefficients(edge, i);
	}
	}
	// copy edge types to output array
	auto host_edge_types = Kokkos::create_mirror_view(edge_types_v);
	Kokkos::deep_copy(host_edge_types, edge_types_v);
	for (int edge_id = 0; edge_id < host_edge_types.extent(0); ++edge_id) {
	edge_types[edge_id] = host_edge_types[edge_id];
	}
	// copy boundary edge ids to output array
	auto host_boundary_edge_ids_with_sign =
	Omega_h::HostRead<Omega_h::LO>(boundary_edges_ids_with_sign);
	for (int i = 0; i < boundary_edges_ids_with_sign.size(); ++i) {
	boundary_edges[i] = host_boundary_edge_ids_with_sign[i];
	}
	// copy face connectivity to output array
	auto host_face_connectivity =
	Kokkos::create_mirror_view(face_connectivity_view);
	Kokkos::deep_copy(host_face_connectivity, face_connectivity_view);
	for (int face = 0; face < mesh->nfaces(); ++face) {
	for (int i = 0; i < 6; ++i) {
	face_connectivity[face * 6 + i] = host_face_connectivity(face, i);
	}
	}