feat: executable plugin #8151

Job	Run time
build test linux x86-64	4m 46s
check-rust	4m 22s
build test windows x86-64	13m 47s
scarb-metadata compatibility check	44s
check-website	11s
doc tests	3m 34s
test linux x86-64 1/8	22m 19s
test linux x86-64 2/8	23m 46s
test linux x86-64 3/8	20m 17s
test linux x86-64 4/8	17m 41s
test linux x86-64 5/8	16m 20s
test linux x86-64 6/8	13m 24s
test linux x86-64 7/8	13m 51s
test linux x86-64 8/8	15m 41s
test windows x86-64 1/8	19m 36s
test windows x86-64 2/8	21m 43s
test windows x86-64 3/8	19m 32s
test windows x86-64 4/8	15m 55s
test windows x86-64 5/8	16m 48s
test windows x86-64 6/8	12m 47s
test windows x86-64 7/8	13m 19s
test windows x86-64 8/8	14m 29s
	5h 4m 52s

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