### 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.
return Mock(boto3.client("apigateway", region_name=config.DEFAULT_REGION))
def test_render_template_values():
    util = VelocityUtil()
    encoded = util.urlEncode("x=a+b")
    assert encoded == "x%3Da%2Bb"
    decoded = util.urlDecode("x=a+b")
    assert decoded == "x=a b"
    escape_tests = (
        ("it's", '"it\'s"'),
        ("0010", "10"),
        ("true", "true"),
        ("True", '"True"'),
        ("1.021", "1.021"),
        ("'''", "\"'''\""),
        ('""', '""'),
        ('"""', '"\\"\\"\\""'),
        ('{"foo": 123}', '{"foo": 123}'),
        ('{"foo"": 123}', '"{\\"foo\\"\\": 123}"'),
        (1, "1"),
        (True, "true"),
    )
    for string, expected in escape_tests:
        escaped = util.escapeJavaScript(string)
        assert escaped == expected
        
        json.loads(escaped)
class TestJSONPatch(unittest.TestCase):