perf(katana-rpc): spawn blocking tasks #4446

Job	Run time
dojo-spawn-and-move-example-test	3m 19s
docs	3m 20s
dojo-core-test	3m 32s
clippy	3m 15s
dojo-world-bindings-check	2m 23s
ensure-wasm	1m 29s
ensure-windows	4m 47s
fmt	1m 7s
test	8m 38s
test-hurl	1m 36s
	33m 26s

Provide feedback