Embed scarb plugin manifest #3354

Job	Run time
clippy	3m 45s
dojo-defi-test	15m 48s
dojo-core-test	8m 39s
dojo-erc-test	30m 7s
docs	11m 51s
dojo-primitive-test	7m 26s
dojo-spawn-and-move-example-test	5m 41s
ensure-wasm	8m 1s
fmt	36s
test	17m 26s
test-hurl	2m 43s
	1h 52m 3s

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