Support Avro schema generation?

[pjantrania]

Hello,

I was looking for a way to generate a schema compatible with Avro based on a struct (for use with Apache Kafka), and it seems schemars is very close to doing this. Has this been considered before as a feature? Looking through the code, there are a lot of customization facilities, and I'd like to take a stab at implementing, but I wanted to check if it's been thought of or seems like a bad idea.