Backward-compatibility rules on LIST type is unclear

[wgtmac]

Describe the enhancement requested

The C++ reader of parquet-cpp is having a hard time to read Parquet file written by parquet-java with parquet.avro.write-old-list-structure=true and schema below:

optional group a (LIST) {
  repeated group array (LIST) {
    repeated int32 array;
  }
}

See apache/arrow#43994 and apache/arrow#43995