### 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
"""Look up and return the API GW resource (path pattern + resource dict) for the given invocation context."""
    path_map = helpers.get_rest_api_paths(
        rest_api_id=invocation_context.api_id, region_name=invocation_context.region_name
    )
    relative_path = invocation_context.invocation_path
    try:
        extracted_path, resource = get_resource_for_path(path=relative_path, path_map=path_map)
        invocation_context.resource = resource
        return extracted_path, resource
    except Exception:
        return None, None
def get_target_resource_method(invocation_context: ApiInvocationContext) -> Optional[Dict]:
    """Look up and return the API GW resource method for the given invocation context."""
    _, resource = get_target_resource_details(invocation_context)
    if not resource:
        return None
    methods = resource.get("resourceMethods") or {}
    method_name = invocation_context.method.upper()
    method_details = methods.get(method_name) or methods.get("ANY")
    return method_details
def get_stage_variables(api_id: str, stage: str) -> Dict[str, str]: