feat: executable plugin #8150

Job	Run time
build test linux x86-64	4m 47s
check-rust	4m 13s
scarb-metadata compatibility check	40s
build test windows x86-64	12m 55s
check-website	11s
doc tests	3m 19s
test linux x86-64 1/8	22m 6s
test linux x86-64 2/8	24m 7s
test linux x86-64 3/8	19m 28s
test linux x86-64 4/8	18m 19s
test linux x86-64 5/8	15m 55s
test linux x86-64 6/8	13m 11s
test linux x86-64 7/8	13m 36s
test linux x86-64 8/8	15m 16s
test windows x86-64 1/8	20m 3s
test windows x86-64 2/8	21m 51s
test windows x86-64 3/8	19m 48s
test windows x86-64 4/8	15m 41s
test windows x86-64 5/8	17m 7s
test windows x86-64 6/8	12m 13s
test windows x86-64 7/8	13m 21s
test windows x86-64 8/8	14m 21s
	5h 2m 28s

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