feat(lsp): allow function rename #4200

Job	Run time
build-acvm-js	2m 22s
build-nargo	2m 18s
build-noirc-abi	2m 21s
build-noir-wasm	2m 24s
noir-js-backend-barretenberg	42s
noirc_abi	45s
noir_wasm	1m 20s
ACVM JS (Node.js)	43s
ACVM JS (Browser)	2m 8s
Integration Tests (Node)	5m 29s
Noir JS	1m 32s
Integration Tests (Browser)	5m 17s
noir_codegen	59s
End	1s
	28m 21s

Provide feedback