feat(*): remove spin shim from the repo #434

Job	Run time
rustfmt	8m 31s
build-wasm-images / build_and_push (examples/slight-rust-hello, images/slight)	1m 41s
build / build (ubuntu-latest, x86_64, slight, v1)	18m 15s
build-wasm-images / build_and_push (examples/wws-js-hello, images/wws)	13s
build / build (ubuntu-latest, x86_64, wws, v1)	15m 38s
build-wasm-images / build_and_push (examples/lunatic-rust-hello, images/lunatic)	44s
build / build (ubuntu-latest, x86_64, lunatic, v1)	12m 43s
build-wasm-images / build_and_push (examples/lunatic-spawn, images/lunatic-spawn)	1m 42s
build-wasm-images / build_and_push (examples/lunatic-submillisecond, images/lunatic-submillisecond)	3m 31s
build / build (ubuntu-latest, aarch64, slight, v1)	19m 31s
build / build (ubuntu-latest, aarch64, wws, v1)	14m 40s
build / build (ubuntu-latest, aarch64, lunatic, v1)	12m 40s
test	5m 55s
	1h 55m 44s

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