Add function for splitting units and add a test #11138

Job	Run time
Example notebooks (ubuntu-latest / Python 3.12)	19m 50s
Doctests (ubuntu-latest / Python 3.11)	3m 31s
Example scripts (ubuntu-latest / Python 3.12)	13m 28s
Tests (ubuntu-latest / Python 3.9)	30m 20s
style	22s
Tests (ubuntu-latest / Python 3.10)	30m 21s
Tests (ubuntu-latest / Python 3.11)	26m 37s
Tests (ubuntu-latest / Python 3.12)	33m 22s
Tests (macos-13 / Python 3.9)	31m 13s
Tests (macos-13 / Python 3.10)	27m 46s
Tests (macos-13 / Python 3.11)	28m 21s
Tests (macos-13 / Python 3.12)	24m 41s
Tests (macos-14 / Python 3.9)	11m 46s
Tests (macos-14 / Python 3.10)	14m 32s
Tests (macos-14 / Python 3.11)	11m 1s
Tests (macos-14 / Python 3.12)	9m 8s
Tests (windows-latest / Python 3.9)	29m 54s
Tests (windows-latest / Python 3.10)	33m 40s
Tests (windows-latest / Python 3.11)	31m 40s
Tests (windows-latest / Python 3.12)	28m 14s
	7h 19m 47s

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