feat: reuse witnesses more when interacting with memory #286

Job	Run time
build-nargo	2m 17s
build-acvm-js	3m 6s
build-noir-wasm	5m 5s
source-resolver	33s
build-noirc-abi	3m 43s
ACVM JS (Node.js)	17s
ACVM JS (Browser)	1m 9s
noirc_abi	24s
noir_codegen	43s
Noir JS	1m 17s
noir-js-backend-barretenberg	30s
Integration Tests	8m 40s
noir_wasm	2m 35s
End	1s
	30m 20s

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