[FTheoryTools] Implement G4-fluxes #15758

Job	Run time
doctest (1.10, ubuntu-latest)	26m 33s
doctest (1.11-nightly, ubuntu-latest)	24m 48s
doctest (nightly, ubuntu-latest)	28m 24s
test (1.6, short, ubuntu-latest)	1h 9m 4s
test (1.6, long, ubuntu-latest)	54m 26s
test (1.10, short, ubuntu-latest)	52m 35s
doctest (1.10, ubuntu-latest, depwarn=error)	25m 43s
test (1.10, long, ubuntu-latest)	45m 18s
doctest (1.10, macOS, RPTU)	12m 22s
test (1.11-nightly, short, ubuntu-latest)	59m 10s
test (1.11-nightly, long, ubuntu-latest)	47m 18s
test (nightly, short, ubuntu-latest)	1h 3m 47s
test (nightly, long, ubuntu-latest)	52m 41s
test (1.10, short, ubuntu-latest, depwarn=error)	51m 31s
test (1.10, long, ubuntu-latest, depwarn=error)	47m 22s
test (1.10, short, macOS, RPTU)	12m 18s
test (1.10, long, macOS, RPTU)	12m 48s
test (1.10, book, ubuntu-latest)	50m 49s
	12h 16m 57s

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