Added Filters aggregation

A multi-bucket aggregation where multiple filters can be defined (each filter defines a bucket). The buckets will collect all the documents that match their associated filter.

This aggregation can be very useful when one wants to compare analytics between different criterias. It can also be accomplished using multiple definitions of the single filter aggregation, but here, the user will only need to define the sub-aggregations only once.

(this is a continuation of Pull Request #6119)

Closes #6118,#6119
Could you make the reduction create a new aggregation instead of filling the first one? This proved to be error-prone in the past.