Introduce per-crate plugins #8499

Job	Run time
build test linux x86-64	1m 51s
check-rust	1m 56s
build test windows x86-64	5m 39s
check-website	13s
scarb-metadata compatibility check	50s
snforge-init	3m 30s
doc tests	3m 9s
test prebuilt plugins linux x86-64	1m 32s
test prebuilt plugins windows x86-64	5m 41s
test prebuilt plugins macos arm64	1m 47s
test prebuilt plugins macos x86-64	2m 37s
test ${{ matrix.platform.name }} ${{ matrix.partition }}/4	0s
	28m 45s

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