feat(katana-pool): invalidate declare tx if the class already exists … #1

Job	Run time
build	1s
cairofmt	8s
clippy	1s
docs	13m 36s
dojo-world-bindings-check	8m 57s
ensure-wasm	8m 12s
fmt	2m 20s
dojo-core-test	0s
test-hurl	0s
dojo-spawn-and-move-example-test	0s
ensure-docker	0s
ensure-windows	0s
test	0s
	33m 15s

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