### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

`#return` macro for AppSync is not supported

```
- ["Error in template '<string>' at position 48-60 in expression: #return($v1)\nException: no such macro: return\n\nGraphQL request:3:11\n2 |         {\n3 |           hi2 {\n  |           ^\n4 |             value"] None
```

### Expected Behavior

`#return` is a valid command in AppSync Resolver Velocity request and response templates.

https://docs.aws.amazon.com/appsync/latest/devguide/aws-appsync-directives.html 

### How are you starting LocalStack?

With the `localstack` script

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    localstack start

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

1. `CDKDeployment`
2. GraphQL Rest API to `localstack`

3. AppSync resolver with response template:

```vtl
#set($v1 = {})
$util.qr($v1.put('value', 'hi'))
#return($v1)"
```

```sdl
schema {
  query: Query
}
type valueObj {
  value: String
}
type Query {
  hi2: valueObj
}
```

4. Query AppSync

```sdl
Query {
   hi2
}
```



### Environment

```markdown
- OS: Ubuntu/WSL2
- LocalStack: 0.14.2.1
```


### Anything else?

The same code runs fine on AWS/AppSync.
template = "#set($list = $input.path('$.records')) $list.size()"
        body = {"records": [{"data": {"foo": "bar1"}}, {"data": {"foo": "bar2"}}]}
        variables = {
            "input": {
                "body": body,
            },
        }
        result = ApiGatewayVtlTemplate().render_vtl(template, variables)
        assert result == " 2"
    def test_message_transformation(self):
        template = APIGW_TEMPLATE_TRANSFORM_KINESIS
        records = [
            {"data": {"foo": "foo1", "bar": "bar2"}},
            {"data": {"foo": "foo1", "bar": "bar2"}, "partitionKey": "key123"},
        ]
        variables = {"input": {"body": {"records": records}}}
        def do_test(_vars):
            res = ApiGatewayVtlTemplate().render_vtl(template, _vars, as_json=True)
            data_encoded = res["Records"][0]["Data"]
            assert res["Records"][0]["PartitionKey"] == data_encoded
            assert res["Records"][1]["PartitionKey"] == "key123"
        
        do_test(variables)
        
        records = []
        variables = {"input": {"body": {"records": records}}}
        
        result = ApiGatewayVtlTemplate().render_vtl(template, variables, as_json=True)
        assert result["Records"] == []
    def test_array_in_set_expr(self):