Support for Custom properties #1
Description
Add support for custom properties like Apache Avro schemaBuilder has: https://avro.apache.org/docs/1.7.6/api/java/org/apache/avro/SchemaBuilder.html
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Add support for custom properties like Apache Avro schemaBuilder has: https://avro.apache.org/docs/1.7.6/api/java/org/apache/avro/SchemaBuilder.html