feat: add support for u16/i16 #6747

Job	Run time
build-nargo	2m 21s
build-noirc-abi	1m 53s
build-noir-wasm	4m 5s
build-acvm-js	1m 45s
ACVM JS (Node.js)	42s
ACVM JS (Browser)	1m 12s
noir-js-backend-barretenberg	41s
noirc_abi	1m 19s
Noir JS	1m 42s
noir_codegen	1m 1s
noir_wasm	1m 36s
Integration Tests (Browser)	5m 45s
Integration Tests (Node)	3m 34s
End	1s
	27m 37s

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