### 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 json
import os
import unittest
from unittest.mock import Mock
import boto3
import pytest
from localstack import config
from localstack.constants import APPLICATION_JSON
from localstack.services.apigateway.helpers import (
    Resolver,
    apply_json_patch_safe,
    extract_path_params,
    extract_query_string_params,
    get_resource_for_path,
)
from localstack.services.apigateway.integration import (
    RequestTemplates,
    ResponseTemplates,
    VelocityUtil,
)
from localstack.services.apigateway.invocations import (
    ApiInvocationContext,
    RequestValidator,
    apply_request_parameters,
)
from localstack.utils.aws.aws_responses import requests_response
from localstack.utils.common import clone
from localstack.utils.files import load_file
def load_test_resource(file_name: str, file_path: str = None) -> str: