API feature request: Add mediaID for media_extended objects

Twitter has separate ids also for media which can be used for deduplication. It might be a nice addition to the media_extended objects. 

The ids can be found from twitter alongside media's other properties
```
"extended_entities": {
    "media": [{
        "id_str": "1954724795586850816",
        "media_url_https": "https:\/\/pbs.twimg.com\/media\/GyCT2FKaMAA9JgV.jpg",
        ...
```
