perf(katana-rpc): spawn blocking tasks #4419

Job	Run time
dojo-core-test	3m 56s
clippy	1m 49s
dojo-spawn-and-move-example-test	3m 23s
docs	1m 55s
dojo-world-bindings-check	2m 18s
ensure-wasm	1m 27s
fmt	1m 7s
ensure-windows	5m 46s
test	3m 24s
test-hurl	1m 24s
	26m 29s

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