Move novelty computation into a separate method #2495

Job	Run time
benchmarks	1m 37s
examples	3m 17s
docs	2m 17s
coverage	1m 48s
pre-commit	1m 1s
pin	2m 30s
test (ubuntu-latest, 3.12)	1m 28s
tutorials_list	6s
test (macos-latest, 3.12)	1m 19s
test (windows-latest, 3.12)	4m 33s
tutorials (tutorials/arm_repertoire.ipynb)	1m 16s
tutorials (tutorials/cma_mae.ipynb)	8m 28s
tutorials (tutorials/features/example.ipynb)	48s
tutorials (tutorials/fooling_mnist.ipynb)	3m 59s
tutorials (tutorials/lsi_mnist.ipynb)	8m 12s
tutorials (tutorials/lunar_lander.ipynb)	9m 15s
tutorials (tutorials/scalable_cma_mae.ipynb)	4m 29s
deploy	0s
	56m 23s

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