Add get_activity() function to deplete.Results class (#2617) #3047

Job	Run time
Python 3.10 (omp=n, mpi=n, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 0m 27s
Python 3.10 (omp=y, mpi=n, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	2h 23m 20s
Python 3.10 (omp=n, mpi=y, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	45m 27s
Python 3.10 (omp=y, mpi=y, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	2h 6m 55s
Python 3.7 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	1h 2m 46s
Python 3.8 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	1h 2m 2s
Python 3.9 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	1h 6m 45s
Python 3.11 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	1h 27m 38s
Python 3.10 (omp=y, mpi=y, dagmc=y, ncrystal=, libmesh=, event= vectfit=)	2h 42m 2s
Python 3.10 (omp=n, mpi=n, dagmc=, ncrystal=y, libmesh=, event= vectfit=)	1h 26m 39s
Python 3.10 (omp=y, mpi=y, dagmc=, ncrystal=, libmesh=y, event= vectfit=)	2h 20m 46s
Python 3.10 (omp=y, mpi=n, dagmc=, ncrystal=, libmesh=y, event= vectfit=)	2h 49m 29s
Python 3.10 (omp=y, mpi=n, dagmc=, ncrystal=, libmesh=, event=y vectfit=)	3h 5m 10s
Python 3.10 (omp=n, mpi=y, dagmc=, ncrystal=, libmesh=, event= vectfit=y)	54m 37s
finish	4s
	1d 0h 14m 7s

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