Debezium now supports size limitnig queue in its internals.
The SourceRecord is measured using low-level JVM implementation.

As source records have a schema attached this issue should

• Implement alternative object size calculator based on schema description, presence of fields and arrays sizes
• Compare the performance with current implementation
• If performance is better then replace the implementation and remove Guava dependency

Further related to-dos:

• Replace Thread.sleep() with Metronome in enqueue()

Follow-up to https://github.com/debezium/debezium/pull/1922