### 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.
import copy
import json
import re
from typing import Dict
import airspeed
from localstack.utils.objects import recurse_object
from localstack.utils.patch import patch
class VtlTemplate:
    """Utility class for rendering velocity templates"""
    def render_vtl(self, template, variables: dict, as_json=False):
        if variables is None:
            variables = {}
        if not template:
            return template
        
        template = re.sub(r"(^|\n)#\s+set(.*)", r"\1#set\2", template, re.MULTILINE)
        
        empty_placeholder = " __pLaCe-HoLdEr__ "
        template = re.sub(
            r"([^\s]+)#\$({)?(.*)",
            r"\1#%s$\2\3" % empty_placeholder,
            template,
            re.MULTILINE,
        )
        
        class ExtendedString(str):
            def trim(self, *args, **kwargs):
                return ExtendedString(self.strip(*args, **kwargs))
            def toLowerCase(self, *_, **__):