feat: nargo command to generate shell completions #14843

Job	Run time
build-acvm-js	1m 23s
build-nargo	2m 21s
build-noirc-abi	1m 30s
build-noir-wasm	3m 39s
ACVM JS (Node.js)	43s
ACVM JS (Browser)	1m 30s
noirc_abi	1m 34s
Example scripts	10s
noir_codegen	1m 1s
Noir JS	1m 11s
Check external repo - ${{ matrix.project.repo }}	0s
noir_wasm	1m 33s
Integration Tests (Browser)	2m 15s
Integration Tests (Node)	2m 24s
End	1s
	21m 15s

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