Reading Avro files supports other types

### Is your feature request related to a problem or challenge?

I am now integrating [incubator-paimon](https://github.com/apache/incubator-paimon)(it is a streaming data lake platform), when reading the avro file, an exception message will appear: **expected avro schema to be a record**, because `AvroArrowArrayReader` only supports `AvroSchema::Record`, but the avro file format of paimon is Union type（[code here](https://github.com/apache/incubator-paimon/blob/d2ddaa9bfb865a93b12c7a0294cf936071bbc08b/paimon-format/src/main/java/org/apache/paimon/format/avro/AvroSchemaConverter.java#L224)）

### Describe the solution you'd like

It would be better if the parsing format could be implemented by the user. The default implementation is still the current way, no problem.

### Describe alternatives you've considered

My current solution: [here](https://github.com/Asura7969/arrow-datafusion/blob/8e3b23561baded77c1604a936dea1f40d30ebd66/datafusion/core/src/datasource/avro_to_arrow/arrow_array_reader.rs#L84) and [this](https://github.com/Asura7969/arrow-datafusion/blob/8e3b23561baded77c1604a936dea1f40d30ebd66/datafusion/core/src/datasource/avro_to_arrow/arrow_array_reader.rs#L110)

### Additional context

_No response_

从 AvroArrowArrayReader 和链接的 arrow_array_reader.rs 示例开始，了解当前的 Record-only 路径以及提议的由用户提供解析逻辑的方法。定义一个扩展点，在保留当前默认行为的同时，允许处理 Paimon 等来源的 Union Avro 输入，然后验证现有 reader 的行为和新路径。

由索引模型根据 Issue 内容生成。