Add once_map package #7871

Job	Run time
build test linux x86-64	3m 38s
check-rust	3m 40s
build test windows x86-64	11m 6s
check-website	15s
scarb-metadata compatibility check	45s
doc tests	3m 11s
test linux x86-64 1/8	21m 32s
test linux x86-64 2/8	24m 14s
test linux x86-64 3/8	19m 29s
test linux x86-64 4/8	17m 59s
test linux x86-64 5/8	15m 33s
test linux x86-64 6/8	13m 4s
test linux x86-64 7/8	13m 11s
test linux x86-64 8/8	14m 17s
test windows x86-64 1/8	18m 25s
test windows x86-64 2/8	20m 42s
test windows x86-64 3/8	17m 43s
test windows x86-64 4/8	15m 10s
test windows x86-64 5/8	14m 40s
test windows x86-64 6/8	11m 43s
test windows x86-64 7/8	11m 42s
test windows x86-64 8/8	12m 59s
	4h 44m 58s

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