Make Experimental MoLang's query.target and -> operator official

The experimental Molang feature query.target and the arrow operator (->) are extremely useful but right now they can't be used in the marketplace since it's experimental.

We'll be able to make addons with so many cool features even if we just have query.target and the arrow operator, for example:

- Entities that follow other entities and match their speed (e.g. horse carts, trains)
- Entities that have animations that respond to players coming near gradually (e.g. a venus fly trap's mouth opens upon approach slowly, but if you back away, its mouth closes again)
- Entities that can mirror other entities (e.g. crouch when you're crouching, walk in the same direction/opposite direction when you're walking). This can be used extensively for cool puzzle games.

Having smooth following behavior is one of the most desirable features for addons, but is really really difficult or impossible without the query.target and arrow operator feature. 

Please make it an official feature soon! I have tried these features successfully in experimental mode and didn't find bugs so far.