feat: executable plugin #8228

Job	Run time
build test linux x86-64	4m 29s
check-rust	3m 46s
build test windows x86-64	8m 54s
check-website	9s
scarb-metadata compatibility check	43s
doc tests	3m 32s
test linux x86-64 1/8	20m 48s
test linux x86-64 2/8	25m 5s
test linux x86-64 3/8	20m 14s
test linux x86-64 4/8	18m 12s
test linux x86-64 5/8	16m 11s
test linux x86-64 6/8	14m 58s
test linux x86-64 7/8	12m 54s
test linux x86-64 8/8	14m 19s
test windows x86-64 1/8	19m 15s
test windows x86-64 2/8	22m 50s
test windows x86-64 3/8	20m 21s
test windows x86-64 4/8	16m 46s
test windows x86-64 5/8	16m 35s
test windows x86-64 6/8	13m 53s
test windows x86-64 7/8	12m 29s
test windows x86-64 8/8	13m 27s
	4h 59m 50s

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