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Initial release of kafka-aggregator with the following features:
* Use Faust windowing feature to aggregate a stream of messages.
* Use Faust-avro to add Avro serialization and Schema Registry support to Faust.
* Support to an internal Schema Registry to store schemas for the aggreated topics (optional).
* Create aggregation topic schemas from the source topic schemas and from the list of summary statistics to be computed.
* Ability to create Faust records dynamically from aggregation topic schemas.
* Ability to auto-generate code for the Faust agents (stream processors).
* Compute summary statistics for numeric fields: ``min()``, ``mean()``, ``median()``, ``stdev()``, ``max()``.
* Add example module to initialize a number of source topics in kafka, control the number of fields in each topic, and produce messages for those topics at a given frequency.
* Use Kafdrop to inspect messages from source and aggregated topics.
* Add kafka-aggregator documentation site.