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Add the ability to generate data directly from DDL column definitions, both via the CLI and programmatically as a library. CLI changes: - Add --ddl and --ddl-path flags as alternatives to --script/--script-path - Add --dataset-name flag to specify the table name (default: 'data') Library API: - New ddl_to_script module: parses DDL column definitions and converts them to Beamline Ion scripts with appropriate Uniform generators - New ddl_generator module: DdlDataGenerator builder provides a high-level API for programmatic data generation from DDL Supported DDL types: VARCHAR, TINYINT/INT8, SMALLINT/INT16, INT/INT32, INT64/BIGINT, DOUBLE/FLOAT, DECIMAL(p,s), BOOL, TIMESTAMP, STRUCT<>, ARRAY<>, UNION<>. Handles OPTIONAL and NOT NULL modifiers. Includes 26 unit tests covering parsing, type mapping, error handling, reproducibility, and end-to-end generation.
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