Aggregations: Properly support top_hits aggregation in a nested and reverse_nested aggregations.

At the moment the `top_hits` aggregation fails if it is being put in a nested or reverse_nested aggregations. This PR add proper support for nested inner objects being emitted as hits in the `top_hits` aggregator. All the known fetch phase features are supported.

This PR adds fetch infrastructure to get #3022 in as well.
What if there are two levels of nested docs and hits are on the 1st level while we are sorting on a property of the 2nd level?