Add support for the parent operator `^`

[Guy Korland]

e.g.

$.store.book[*].authors[?(@.lastName=="Waugh")]^title

Example JSON:

{
    "store": {
        "book": [
            {
                "authors": [
                    {
                        "firstName": "Nigel",
                        "lastName": "Rees"
                    },
                    {
                        "firstName": "Evelyn",
                        "lastName": "Waugh"
                    }
                ],
                "title": "Sayings of the Century"
            },
            {
                "authors": [
                    {
                        "firstName": "Herman",
                        "lastName": "Melville"
                    },
                    {
                        "firstName": "Somebody",
                        "lastName": "Else"
                    }
                ],
                "title": "Moby Dick"
            }
        ]
    }
}

ref RedisJSON/RedisJSON#494