Add support for Vector outputs in multicalls

[camsjams]

Motivation

Similar to a bug in RS-SDK, Multicall support with Vector output needs support

Usage example

fuels-ts/packages/fuel-gauge/src/coverage-contract.test.ts

Lines 531 to 565 in 0c0f78c

	it.skip('should handle multiple calls [with vectors]', async () => {
	const INPUT_A = [hexlify(randomBytes(32)), hexlify(randomBytes(32)), hexlify(randomBytes(32))];
	const INPUT_B = [hexlify(randomBytes(32))];
	const INPUT_C = hexlify(randomBytes(32));
	const INPUT_D = hexlify(randomBytes(32));
	const { value: results } = await contractInstance
	.multiCall([
	contractInstance.functions.echo_b256_middle(INPUT_A, INPUT_B, INPUT_C, INPUT_D),
	contractInstance.functions.echo_u8(13),
	contractInstance.functions.echo_u8(23),
	contractInstance.functions.echo_enum_small(SmallEnum.Empty),
	contractInstance.functions.echo_b256_middle(INPUT_B, INPUT_A, INPUT_C, INPUT_D),
	])
	.call();
	expect(results).toStrictEqual([INPUT_B, 13, 23, SmallEnum.Empty, INPUT_A]);
	});
	it.skip('should handle multiple calls [with vectors + stack data first]', async () => {
	const INPUT_A = [hexlify(randomBytes(32)), hexlify(randomBytes(32)), hexlify(randomBytes(32))];
	const INPUT_B = [hexlify(randomBytes(32))];
	const INPUT_C = hexlify(randomBytes(32));
	const INPUT_D = hexlify(randomBytes(32));
	const { value: results } = await contractInstance
	.multiCall([
	contractInstance.functions.echo_u8(1),
	contractInstance.functions.echo_u8(2),
	contractInstance.functions.echo_enum_small(SmallEnum.Empty),
	contractInstance.functions.echo_b256_middle(INPUT_A, INPUT_B, INPUT_C, INPUT_D),
	contractInstance.functions.echo_b256_middle(INPUT_B, INPUT_A, INPUT_C, INPUT_D),
	])
	.call();
	expect(results).toStrictEqual([1, 2, SmallEnum.Empty, INPUT_B, INPUT_A]);
	});

Possible implementations

No response

[camsjams]

Closed - see #1192