Add "voltage as a state" option #10800

Job	Run time
style	24s
Example scripts (ubuntu-latest / Python 3.12)	12m 59s
Tests (ubuntu-latest / Python 3.9)	30m 33s
Doctests (ubuntu-latest / Python 3.11)	3m 54s
Example notebooks (ubuntu-latest / Python 3.12)	19m 5s
Tests (ubuntu-latest / Python 3.10)	30m 45s
Tests (ubuntu-latest / Python 3.11)	27m 28s
Tests (ubuntu-latest / Python 3.12)	33m 35s
Tests (macos-12 / Python 3.9)	22m 5s
Tests (macos-12 / Python 3.10)	22m 25s
Tests (macos-12 / Python 3.11)	19m 40s
Tests (macos-12 / Python 3.12)	22m 14s
Tests (macos-14 / Python 3.9)	12m 28s
Tests (macos-14 / Python 3.10)	11m 8s
Tests (macos-14 / Python 3.11)	18m 53s
Tests (macos-14 / Python 3.12)	9m 32s
Tests (windows-latest / Python 3.9)	30m 51s
Tests (windows-latest / Python 3.10)	32m 7s
Tests (windows-latest / Python 3.11)	30m 7s
Tests (windows-latest / Python 3.12)	25m 32s
	6h 55m 45s

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