feat: executable plugin #8138

Job	Run time
build test linux x86-64	5m 27s
check-website	9s
check-rust	4m 8s
build test windows x86-64	13m 25s
scarb-metadata compatibility check	44s
doc tests	3m 35s
test linux x86-64 1/8	21m 49s
test linux x86-64 2/8	24m 43s
test linux x86-64 3/8	19m 36s
test linux x86-64 4/8	17m 40s
test linux x86-64 5/8	16m 12s
test linux x86-64 6/8	13m 19s
test linux x86-64 7/8	13m 45s
test linux x86-64 8/8	14m 33s
test windows x86-64 1/8	19m 41s
test windows x86-64 2/8	21m 42s
test windows x86-64 3/8	19m 23s
test windows x86-64 4/8	16m 7s
test windows x86-64 5/8	17m 24s
test windows x86-64 6/8	12m 46s
test windows x86-64 7/8	12m 46s
test windows x86-64 8/8	14m 43s
	5h 3m 37s

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