Add once_map package #7872

Job	Run time
build test linux x86-64	3m 56s
check-rust	4m 1s
build test windows x86-64	11m 21s
check-website	18s
scarb-metadata compatibility check	42s
doc tests	3m 22s
test linux x86-64 1/8	21m 53s
test linux x86-64 2/8	23m 52s
test linux x86-64 3/8	19m 8s
test linux x86-64 4/8	18m 5s
test linux x86-64 5/8	15m 36s
test linux x86-64 6/8	13m 29s
test linux x86-64 7/8	13m 1s
test linux x86-64 8/8	14m 31s
test windows x86-64 1/8	18m 51s
test windows x86-64 2/8	19m 58s
test windows x86-64 3/8	17m 52s
test windows x86-64 4/8	15m 3s
test windows x86-64 5/8	15m 10s
test windows x86-64 6/8	11m 50s
test windows x86-64 7/8	12m 7s
test windows x86-64 8/8	13m 16s
	4h 47m 22s

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