feat: backpropagate constants in ACIR during optimization #4452

Job	Run time
build-acvm-js	2m 17s
build-nargo	2m 22s
build-noirc-abi	2m 28s
build-noir-wasm	3m 37s
ACVM JS (Node.js)	37s
ACVM JS (Browser)	1m 43s
noir-js-backend-barretenberg	46s
Noir JS	1m 31s
noir_codegen	1m 4s
noirc_abi	45s
Integration Tests (Browser)	5m 12s
Integration Tests (Node)	5m 25s
noir_wasm	1m 6s
End	1s
	28m 54s

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