feat: implement DataWriter for Iceberg data files #552
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Implements DataWriter class for writing Iceberg data files as part of issue apache#441 (task 2). Implementation: - Factory method DataWriter::Make() for creating writer instances - Support for Parquet and Avro file formats via WriterFactoryRegistry - Complete DataFile metadata generation including partition info, column statistics, serialized bounds, and sort order ID - Proper lifecycle management with Initialize/Write/Close/Metadata - PIMPL idiom for ABI stability Tests: - 12 comprehensive unit tests covering creation, write/close lifecycle, metadata generation, error handling, and feature validation - All tests passing (12/12) Related to apache#441
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Implements DataWriter class for writing Iceberg data files as part of issue #441 (task 2).
Implementation:
Related to #441