Added bipolar membrane unit model and costing #8953

Job	Run time
Check code is formatted (Black)	17s
Code linting (pylint)	4m 25s
macOS setup (EXPERIMENTAL) (3.9)	1h 3m 24s
Tests (py3.9/linux)	55m 47s
pytest (user mode) (py3.9/linux)	37m 48s
Tests (py3.9/win64)	1h 21m 2s
Test notebooks (py3.9/linux)	5m 14s
pytest (user mode) (py3.9/win64)	39m 24s
Tests (py3.10/linux)	48m 39s
Test notebooks (py3.9/win64)	10m 54s
pytest (user mode) (py3.11/linux)	27m 22s
Tests (py3.10/win64)	1h 37m 37s
Test notebooks (py3.11/linux)	5m 18s
pytest (user mode) (py3.11/win64)	44m 53s
Tests (py3.11/linux)	49m 48s
Test notebooks (py3.11/win64)	11m 53s
Tests (py3.11/win64)	1h 33m 40s
Upload coverage report (Codecov)	11s
	11h 17m 36s

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