feat: Add intrinsic to get if running inside an unconstrained context #7211

Job	Run time
build-noirc-abi	2m 11s
build-nargo	2m 23s
build-acvm-js	1m 20s
build-noir-wasm	4m 3s
ACVM JS (Node.js)	37s
ACVM JS (Browser)	1m 45s
noirc_abi	1m 39s
noir-js-backend-barretenberg	45s
Example scripts	18s
noir_codegen	58s
Noir JS	1m 33s
Integration Tests (Browser)	6m 1s
Integration Tests (Node)	3m 47s
noir_wasm	2m 22s
End	1s
	29m 43s

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