feat: Add capacities to brillig vectors and use them in slice ops #14585

Job	Run time
build-acvm-js	1m 59s
build-nargo	2m 32s
build-noirc-abi	2m 23s
build-noir-wasm	4m 41s
ACVM JS (Browser)	1m 36s
ACVM JS (Node.js)	38s
noirc_abi	1m 21s
Noir JS	1m 12s
noir_codegen	1m 19s
Example scripts	10s
Check external repo - ${{ matrix.project.repo }}	0s
noir_wasm	1m 32s
Integration Tests (Browser)	1m 56s
Integration Tests (Node)	2m 19s
End	1s
	23m 39s

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