Issue Number: close #12574 This pr adds `NewJsonReader` which implements GenericReader interface to support read json format file. TODO: 1. modify `_scann_eof` later. 2. Rename `NewJsonReader` to `JsonReader` when `JsonReader` is deleted.
1. Download parquet file packages from:
https://doris-build-hk-1308700295.cos.ap-hongkong.myqcloud.com/regression/load/tpch1_parquet/tpch1.db.tar.gz
2. Unzip and name it to "tpch1.db"