feat: executable plugin #8227

Job	Run time
check-rust	3m 52s
build test linux x86-64	4m 26s
check-website	17s
build test windows x86-64	10m 9s
scarb-metadata compatibility check	47s
doc tests	3m 29s
test linux x86-64 1/8	6m 1s
test linux x86-64 2/8	7m 50s
test linux x86-64 3/8	13m 50s
test linux x86-64 4/8	7m 51s
test linux x86-64 5/8	12m 32s
test linux x86-64 6/8	6m 28s
test linux x86-64 7/8	6m 56s
test linux x86-64 8/8	6m 59s
test windows x86-64 1/8	19m 13s
test windows x86-64 2/8	23m 19s
test windows x86-64 3/8	19m 59s
test windows x86-64 4/8	16m 3s
test windows x86-64 5/8	16m 53s
test windows x86-64 6/8	13m 35s
test windows x86-64 7/8	12m 44s
test windows x86-64 8/8	13m 31s
	3h 46m 44s

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