feat: executable plugin (#1839) #8232

Job	Run time
check-rust	4m 10s
check-website	12s
build test linux x86-64	5m 17s
scarb-metadata compatibility check	42s
build test windows x86-64	17m 33s
doc tests	3m 34s
test linux x86-64 1/8	21m 31s
test linux x86-64 2/8	25m 21s
test linux x86-64 3/8	20m 23s
test linux x86-64 4/8	17m 54s
test linux x86-64 5/8	16m 3s
test linux x86-64 6/8	14m 26s
test linux x86-64 7/8	12m 45s
test linux x86-64 8/8	14m 39s
test windows x86-64 1/8	19m 13s
test windows x86-64 2/8	23m 11s
test windows x86-64 3/8	20m 10s
test windows x86-64 4/8	16m 52s
test windows x86-64 5/8	16m 58s
test windows x86-64 6/8	13m 10s
test windows x86-64 7/8	12m 45s
test windows x86-64 8/8	13m 44s
	5h 10m 33s

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