Move `ml_tools.extra.plotting` to `visualization.utils` #1943

Job	Run time
mirror-and-integration-test-on-gitlab	0s
check-code-pylint-and-mypy	3m 35s
check-pre-commit-hooks	30s
test-on-github (3.9)	5m 53s
test-on-github (3.10)	4m 5s
test-on-github (3.11)	4m 31s
test-on-github (3.8, true)	9m 54s
	28m 28s

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