Extract Segment.IO listener to Work

Segment.io events are bundled using an asynchronous listener. During Jan the 14th incident, we identified it as taking a lot of resources because of heavy GC and the way events are mapped to Groovy scripts. Plus, all events bundled are managed through 1 transaction, which can lead to heavy work if a large amount similar events occured.

We need to isolate this load to a worker queue for being able to distribute it across nodes and having control of number of events per transaction.

AC:

• We have a Work that does the mapping and the transport to segment.io event
• SegmentListener is triggering a Work every X mapped events
• Segmentio works are in a separate category (by default)