Enhance: Add offset handling in DFTracerAnalyzer

[izzet]

This pull request introduces changes to improve data type handling and extend functionality for processing I/O traces in the dfanalyzer module. The most important changes include adjustments to column data types, the addition of a new offset column, and updates to ensure proper handling of the offset field in I/O trace processing.

Data type adjustments:

• Updated the integer column data type in fix_dtypes to use Int64 instead of Int32 for consistency with other integer columns (dfanalyzer/analysis_utils.py, dfanalyzer/analysis_utils.pyL36-R36).

Enhancements to I/O trace processing:

• Added a new offset column to the schema returned by io_columns to capture offset information (dfanalyzer/dftracer.py, dfanalyzer/dftracer.pyR195).
• Updated io_function to extract and include the offset field from json_dict arguments if present and valid (dfanalyzer/dftracer.py, dfanalyzer/dftracer.pyR216-R219).
• Modified postread_trace to replace zero values in the offset column with NaN for better handling of missing data (dfanalyzer/dftracer.py, dfanalyzer/dftracer.pyR700).

[Copilot]

Pull Request Overview

This pull request enhances the DFTracerAnalyzer to improve data type handling and add offset tracking capabilities for I/O trace processing. The changes focus on standardizing integer data types and extending the schema to capture offset information from I/O operations.

• Updated integer column data type from Int32 to Int64 for consistency across the codebase
• Added offset column to the I/O trace schema to capture file position information
• Enhanced I/O function processing to extract and handle offset values from trace data

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
dfanalyzer/analysis_utils.py	Changed integer column data type from Int32 to Int64 for consistency
dfanalyzer/dftracer.py	Added offset column to schema, enhanced I/O function to extract offset values, and updated postread processing to handle zero offset values