Function to_avro_datum_schemata 

pub fn to_avro_datum_schemata<T: Into<Value>>(
    schema: &Schema,
    schemata: Vec<&Schema>,
    value: T,
) -> AvroResult<Vec<u8>>

Encode a value into raw Avro data, also performs schema validation.

If the provided schema is incomplete then its dependencies must be provided in schemata