chore: split `ops` into `arith` and `bit` modules #6736

Job	Run time
build-nargo	2m 28s
build-nargo	2m 28s
build-acvm-js	1m 22s
build-acvm-js	1m 22s
build-noirc-abi	1m 56s
build-noirc-abi	1m 56s
build-noir-wasm	3m 39s
build-noir-wasm	3m 39s
ACVM JS (Browser)	1m 53s
ACVM JS (Browser)	1m 38s
ACVM JS (Node.js)	40s
ACVM JS (Node.js)	40s
noir-js-backend-barretenberg	41s
noir-js-backend-barretenberg	41s
noirc_abi	1m 17s
noirc_abi	1m 17s
noir_codegen	59s
noir_codegen	59s
Noir JS	1m 31s
Noir JS	1m 31s
Integration Tests (Node)	3m 49s
Integration Tests (Node)	3m 49s
Integration Tests (Browser)	5m 38s
Integration Tests (Browser)	5m 38s
noir_wasm	1m 34s
noir_wasm	1m 34s
End	1s
End	1s
	54m 41s

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