refactor confluent avro serde #45
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Running lots of events through the existing
ConfluentAvroRegistryKafkaRecordSerializationSchemarevealed excessive memory pressure on running operators, degrading performance. We've isolated this problem to the use ofKafkaAvroSerializerclass, especially with how we were creating schema registry clients. We've simplified the code, both on the serializer and deserializer to hopefully reduce the memory pressure.