LieAlgebras: Add Demazure character #17611

Job	Run time
doctest (1.10, ubuntu-latest)	26m 43s
test (1.6, short, ubuntu-latest)	1h 28m 45s
doctest (1.11-nightly, ubuntu-latest)	30m 1s
test (1.6, long, ubuntu-latest)	57m 36s
doctest (nightly, ubuntu-latest)	30m 13s
test (1.10, short, ubuntu-latest)	1h 11m 35s
doctest (1.10, ubuntu-latest, depwarn=error)	29m 24s
test (1.10, long, ubuntu-latest)	46m 22s
doctest (1.10, macOS, RPTU)	14m 2s
test (1.11-nightly, short, ubuntu-latest)	1h 19m 29s
test (1.11-nightly, long, ubuntu-latest)	49m 28s
test (nightly, short, ubuntu-latest)	1h 26m 25s
test (nightly, long, ubuntu-latest)	55m 12s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 13m 34s
test (1.10, long, ubuntu-latest, depwarn=error)	46m 15s
test (1.10, short, macOS, RPTU)	15m 45s
test (1.10, long, macOS, RPTU)	13m 52s
test (1.10, book, ubuntu-latest)	48m 19s
test (nightly, book, ubuntu-latest)	1h 0m 38s
	15h 23m 38s

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