perf(katana-rpc): spawn blocking tasks #4444

Job	Run time
docs	3m 23s
dojo-core-test	3m 33s
dojo-spawn-and-move-example-test	3m 10s
clippy	3m 20s
dojo-world-bindings-check	2m 27s
ensure-wasm	1m 36s
ensure-windows	7m 11s
fmt	1m 5s
test	8m 46s
test-hurl	1m 24s
	35m 55s

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