Enable Topic Compaction

[lepsalex]

Need to check on: https://cwiki.apache.org/confluence/display/KAFKA/KIP-280%3A+Enhanced+log+compaction

Before enabling compaction we need to ensure that we are passing our event UTC time to some yet to be developed custom header for compaction to use to determine order otherwise order is not guaranteed.

Once we confirm that Kafka now supports compaction based on timestamp we need to:

• Upgrade Kafka to version supporting this
• Update Relay to pass a custom compaction timestamp based on event UTC time
• Enable and test compaction in dev by wiping existing topics, running multiple test runs, then re-indexing from compacted topics and assessing data consistency
• Repeat process in QA (this has multiple consumers/producers per topic and is a better test)
• Migrate prod by rerunning relay-splitter into compacted topics, replacing the existing workflow and task topics