[FTheoryTools] Implement G4-fluxes #15750

Job	Run time
test (1.6, short, ubuntu-latest)	1h 7m 38s
doctest (1.10, ubuntu-latest)	25m 6s
test (1.6, long, ubuntu-latest)	56m 39s
doctest (1.11-nightly, ubuntu-latest)	22m 18s
test (1.10, short, ubuntu-latest)	51m 48s
doctest (nightly, ubuntu-latest)	27m 50s
test (1.10, long, ubuntu-latest)	46m 58s
doctest (1.10, ubuntu-latest, depwarn=error)	24m 18s
test (1.11-nightly, short, ubuntu-latest)	59m 2s
test (1.11-nightly, long, ubuntu-latest)	46m 59s
doctest (1.10, macOS, RPTU)	12m 39s
test (nightly, short, ubuntu-latest)	1h 11m 35s
test (nightly, long, ubuntu-latest)	54m 49s
test (1.10, short, ubuntu-latest, depwarn=error)	50m 44s
test (1.10, long, ubuntu-latest, depwarn=error)	43m 50s
test (1.10, short, macOS, RPTU)	11m 46s
test (1.10, long, macOS, RPTU)	12m 43s
test (1.10, book, ubuntu-latest)	50m 4s
	12h 16m 46s

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