refactor(read): split ArrowReader into DataFileReader, DataEvolutionReader and TableRead (#246)

Move the monolithic arrow/reader.rs into three focused modules under table/:
- data_file_reader.rs: regular Parquet file reading with schema evolution
- data_evolution_reader.rs: column-merge reading for data evolution mode
- table_read.rs: TableRead extracted from read_builder.rs

Also replaces assert! with proper error returns and adds bounds checking
in attach_row_id.

Author: JingsongLi

crates/paimon/src/arrow/mod.rs

@@ -17,11 +17,8 @@
 
 pub(crate) mod filtering;
 pub(crate) mod format;
-mod reader;
 pub(crate) mod schema_evolution;
 
-pub use crate::arrow::reader::ArrowReaderBuilder;
-
 use crate::spec::{
     ArrayType, BigIntType, BooleanType, DataField, DataType as PaimonDataType, DateType,
     DecimalType, DoubleType, FloatType, IntType, LocalZonedTimestampType, MapType, RowType,