feat: add `Type::as_struct` #10579

Job	Run time
build-acvm-js	1m 18s
build-nargo	2m 30s
build-noirc-abi	1m 39s
build-noir-wasm	4m 9s
ACVM JS (Node.js)	36s
ACVM JS (Browser)	2m 49s
noirc_abi	1m 29s
Example scripts	13s
Check external repo - zac-williamson/noir-edwards	9s
Noir JS	1m 17s
noir_codegen	1m 23s
noir_wasm	1m 44s
Integration Tests (Node)	2m 13s
Integration Tests (Browser)	1m 56s
End	1s
	23m 26s

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