### 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
AttributeDefinitions=attr_defs,
            ProvisionedThroughput={"ReadCapacityUnits": 10, "WriteCapacityUnits": 10},
            StreamSpecification=stream_spec,
        )
    except Exception as e:
        if "ResourceInUseException" in str(e):
            
            return connect_to_resource("dynamodb", env=env, region_name=region_name).Table(
                table_name
            )
        if "AccessDeniedException" in str(e):
            raise
    if sleep_after:
        
        time.sleep(sleep_after)
    return table
def get_apigateway_integration(api_id, method, path, env=None):
    apigateway = connect_to_service(service_name="apigateway", client=True, env=env)
    resources = apigateway.get_resources(restApiId=api_id, limit=100)
    resource_id = None
    for r in resources["items"]:
        if r["path"] == path:
            resource_id = r["id"]
    if not resource_id:
        raise Exception('Unable to find apigateway integration for path "%s"' % path)
    integration = apigateway.get_integration(
        restApiId=api_id, resourceId=resource_id, httpMethod=method
    )
    return integration
def get_apigateway_resource_for_path(api_id, path, parent=None, resources=None):