Add multigroup support for AggregationEngines

Pavel Shutsinrequested to merge
600674-support-multigroup-aggregation-endpoints into master

What does this MR do and why?

Add multigroup and multiproject filtering support for AggregationEngines

Organizations can filter analytics data by multiple data sources with 20 sources at the most

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Related to #600674 (closed)

Edited by Pavel Shutsin

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