feat: executable plugin #8157

Job	Run time
build test linux x86-64	4m 43s
check-rust	4m 9s
build test windows x86-64	15m 23s
check-website	8s
scarb-metadata compatibility check	47s
doc tests	3m 34s
test linux x86-64 1/8	21m 46s
test linux x86-64 2/8	23m 45s
test linux x86-64 3/8	19m 15s
test linux x86-64 4/8	17m 31s
test linux x86-64 5/8	16m 2s
test linux x86-64 6/8	13m 35s
test linux x86-64 7/8	13m 55s
test linux x86-64 8/8	15m 22s
test windows x86-64 1/8	19m 54s
test windows x86-64 2/8	21m 47s
test windows x86-64 3/8	19m 42s
test windows x86-64 4/8	15m 57s
test windows x86-64 5/8	16m 7s
test windows x86-64 6/8	12m 41s
test windows x86-64 7/8	13m 28s
test windows x86-64 8/8	14m 24s
	5h 3m 55s

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