test: add comprehensive tests for CastExecutor#132
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Purpose
CastExecutorTestComprehensive test suite covering type casting across all supported Paimon data types including numeric primitives (TINYINT, SMALLINT, INT, BIGINT, FLOAT, DOUBLE), string types, decimal, timestamp, and boolean. Tests both literal-level and array-level casting, null handling, overflow detection, and edge cases for each type conversion pair.
Tests
CastExecutorTest