Refactor cuda_utils : move custatevec to lightning_gpu_utils #4461

Job	Run time
Python tests (ubuntu-22.04, lightning_qubit)	47m 22s
C++ tests (ubuntu-22.04, lightning_qubit)	21m 12s
C++ tests (OpenBLAS) (ubuntu-22.04, lightning_qubit)	9m 11s
Python tests with OpenBLAS (ubuntu-22.04, lightning_qubit)	8m 26s
Build and cache Kokkos / Set Kokkos builder matrix	1s
Build and cache Kokkos / Kokkos core (SERIAL)	5s
Build and cache Kokkos / Kokkos core (OPENMP)	3s
C++ tests (Kokkos) (ubuntu-22.04, lightning_kokkos, SERIAL, 4.2.00)	4m 56s
C++ tests (Kokkos) (ubuntu-22.04, lightning_kokkos, OPENMP, 4.2.00)	5m 11s
Python tests with Kokkos (ubuntu-22.04, lightning_kokkos, SERIAL, 4.2.00)	38m 27s
Python tests with Kokkos (ubuntu-22.04, lightning_kokkos, OPENMP, 4.2.00)	39m 21s
C++ tests (multiple backends) (ubuntu-22.04, SERIAL, 4.2.00)	5m 33s
Python tests with Kokkos (ubuntu-22.04, all, SERIAL, 4.2.00)	11m 44s
C++ tests (multiple backends) (ubuntu-22.04, OPENMP, 4.2.00)	5m 31s
Python tests with Kokkos (ubuntu-22.04, all, OPENMP, 4.2.00)	11m 18s
Upload cpp coverage data to codecov	9s
Upload python coverage data to codecov	11s
	3h 28m 41s

Provide feedback