### 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
return (self.resource or {}).get("id")
    @property
    def invocation_path(self) -> str:
        """Return the plain invocation path, without query parameters."""
        path = self.path_with_query_string or self.path
        return path.split("?")[0]
    @property
    def path_with_query_string(self) -> str:
        """Return invocation path with query string - defaults to the value of 'path', unless customized."""
        return self._path_with_query_string or self.path
    @path_with_query_string.setter
    def path_with_query_string(self, new_path: str):
        """Set a custom invocation path with query string (used to handle "../_user_request_/.." paths)."""
        self._path_with_query_string = new_path
    def query_params(self) -> Dict:
        """Extract the query parameters from the target URL or path in this request context."""
        query_string = self.path_with_query_string.partition("?")[2]
        return parse_query_string(query_string)
    @property
    def integration_uri(self) -> Optional[str]: