Add token stream ser/de tests #7766

Job	Run time
check-rust	3m 50s
build test linux x86-64	3m 47s
build test windows x86-64	10m 46s
check-website	10s
scarb-metadata compatibility check	49s
doc tests	3m 8s
test linux x86-64 1/8	16m 14s
test linux x86-64 2/8	18m 20s
test linux x86-64 3/8	14m 46s
test linux x86-64 4/8	13m 54s
test linux x86-64 5/8	11m 30s
test linux x86-64 6/8	10m 51s
test linux x86-64 7/8	10m 4s
test linux x86-64 8/8	11m 19s
test windows x86-64 1/8	14m 40s
test windows x86-64 2/8	16m 38s
test windows x86-64 3/8	15m 1s
test windows x86-64 4/8	12m 57s
test windows x86-64 5/8	12m 21s
test windows x86-64 6/8	9m 16s
test windows x86-64 7/8	9m 33s
test windows x86-64 8/8	10m 18s
	3h 50m 12s

Provide feedback