### 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 aws_stack.create_api_gateway(
        name=gateway_name,
        resources=resources,
        stage_name=stage_name,
        region_name=region_name,
    )
def apply_json_patch_safe(subject, patch_operations, in_place=True, return_list=False):
    """Apply JSONPatch operations, using some customizations for compatibility with API GW
    resources."""
    results = []
    patch_operations = (
        [patch_operations] if isinstance(patch_operations, dict) else patch_operations
    )
    for operation in patch_operations:
        try:
            
            if operation["op"] == "replace" and operation.get("value") is None:
                operation["value"] = ""
            if operation["op"] != "remove" and operation.get("value") is None:
                LOG.info('Missing "value" in JSONPatch operation for %s: %s', subject, operation)
                continue
            if operation["op"] == "add":
                path = operation["path"]
                target = subject.get(path.strip("/"))
                target = target or common.extract_from_jsonpointer_path(subject, path)
                if not isinstance(target, list):