### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

Currently the VTL template for `request_templates` is not processed properly:

```
#set( $body = $input.json("$") )

#macro( loop $map )
{
    #foreach($key in $map.keySet())
        #set( $k = $util.escapeJavaScript($key) )
        #set( $v = $util.escapeJavaScript($map.get($key)).replaceAll("\\'", "'") )
        "$k": "$v"
        #if( $foreach.hasNext ) , #end
    #end
}
#end

{
    "enhancedAuthContext": #loop($context.authorizer),

    "headers": #loop($input.params().header),

    "query": #loop($input.params().querystring),

    "path": #loop($input.params().path),

    "identity": #loop($context.identity),

    "stageVariables": #loop($stageVariables),
}
EOF
}
```

results in,

```
'

{
    "enhancedAuthContext": {
    }
,

    "headers": {
    }
,

    "query": {
    }
,

    "path": {
    }
,

    "identity": {
    }
,

    "stageVariables": {
    }
,
}
'
```

### Expected Behavior

The template should be rendered and have the JSON properties.

### How are you starting LocalStack?

Custom (please describe below)

### Steps To Reproduce

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

    docker run localstack/localstack

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

    awslocal s3 mb s3://mybucket


### Environment

```markdown
- OS: MacOS
- LocalStack: 0.14
```


### Anything else?

This example can be used to validate.
https://github.com/localstack/localstack-terraform-samples/tree/master/apigateway-lambda-velocity
elif path.startswith("/vpclinks"):
                result = handle_vpc_links(method, path, data, headers)
            elif re.match(PATH_REGEX_CLIENT_CERTS, path):
                result = handle_client_certificates(method, path, data, headers)
            if result is not None:
                response.status_code = 200
                aws_responses.set_response_content(response, result, getattr(result, "headers", {}))
        
        if method == "POST" and path == "/restapis":
            content = json.loads(to_str(response.content))
            api_id = content["id"]
            region = aws_stack.extract_region_from_auth_header(headers)
            API_REGIONS[api_id] = region
        
        if method == "POST" and path == "/restapis":
            content = json.loads(to_str(response.content))
            event_publisher.fire_event(
                event_publisher.EVENT_APIGW_CREATE_API,
                payload={"a": event_publisher.get_hash(content["id"])},
            )
        api_regex = r"^/restapis/([a-zA-Z0-9\-]+)$"
        if method == "DELETE" and re.match(api_regex, path):
            api_id = re.sub(api_regex, r"\1", path)
            event_publisher.fire_event(
                event_publisher.EVENT_APIGW_DELETE_API,
                payload={"a": event_publisher.get_hash(api_id)},
            )
class RequestValidator:
    __slots__ = ["context", "apigateway_client"]
    def __init__(self, context: ApiInvocationContext, apigateway_client):