Add once_map package #7869

Job	Run time
build test linux x86-64	3m 49s
build test windows x86-64	10m 38s
doc tests	3m 2s
check-rust	3m 53s
check-website	10s
scarb-metadata compatibility check	41s
test linux x86-64 1/8	21m 48s
test linux x86-64 2/8	23m 45s
test linux x86-64 3/8	19m 5s
test linux x86-64 4/8	18m 4s
test linux x86-64 5/8	15m 29s
test linux x86-64 6/8	13m 28s
test linux x86-64 7/8	13m 19s
test linux x86-64 8/8	14m 30s
test windows x86-64 1/8	18m 44s
test windows x86-64 2/8	20m 21s
test windows x86-64 3/8	18m 10s
test windows x86-64 4/8	15m 41s
test windows x86-64 5/8	14m 59s
test windows x86-64 6/8	11m 25s
test windows x86-64 7/8	11m 58s
test windows x86-64 8/8	12m 36s
	4h 45m 35s

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