Optimize CSV validation and header mapping logic if header is enabled #115
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This commit addresses several changes in the CSV validation and header mapping logic. Firstly, a method to set IDs has been added in Column.php. Also, handling of headers in CSV files has been updated to better support files with and without headers. In addition, mapping of columns by header names has been moved to CsvFile.php from Schema.php for better alignment with data flow. Lastly, unnecessary exception throwing in getColumn method of Schema.php has been removed. Unit tests have also been updated to reflect these changes.