Matroid serialisation and matroid encodings (#3886) #15608

Job	Run time
doctest (1.10, ubuntu-latest)	24m 12s
test (1.6, short, ubuntu-latest)	1h 14m 29s
doctest (1.11-nightly, ubuntu-latest)	22m 52s
test (1.6, long, ubuntu-latest)	56m 57s
doctest (nightly, ubuntu-latest)	22m 16s
test (1.10, short, ubuntu-latest)	51m 26s
doctest (1.10, ubuntu-latest, depwarn=error)	23m 33s
test (1.10, long, ubuntu-latest)	47m 57s
doctest (1.10, macOS, RPTU)	11m 40s
test (1.11-nightly, short, ubuntu-latest)	59m 28s
test (1.11-nightly, long, ubuntu-latest)	49m 40s
test (nightly, short, ubuntu-latest)	59m 26s
test (nightly, long, ubuntu-latest)	47m 18s
test (1.10, short, ubuntu-latest, depwarn=error)	51m 45s
test (1.10, long, ubuntu-latest, depwarn=error)	45m 4s
test (1.10, short, macOS, RPTU)	11m 55s
test (1.10, long, macOS, RPTU)	12m 38s
test (1.10, book, ubuntu-latest)	30m 18s
	11h 42m 54s

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