Bug fix: restrict lines=True to JSON format in Kafka read_gdf method

[a-hirota]

This change modifies the read_gdf method in kafka.py to include the lines=True parameter only when the message format is JSON. For other formats, the lines parameter is omitted to avoid potential errors with unsupported formats.

Description

This pull request modifies the read_gdf method in kafka.py to pass the lines parameter only when the message_format is "json". This prevents lines from being passed to other formats (e.g., CSV, Avro, ORC, Parquet), which do not support this parameter.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

Additional Information

• Problem: Previously, lines=True was passed regardless of the format, causing issues with formats that do not support lines.
• Solution: Updated read_gdf in kafka.py to conditionally add the lines=True parameter only for JSON format.
• Additional Context: This change improves compatibility with different file formats and prevents errors when reading non-JSON formats.

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[vyasr]

/ok to test

[vyasr]

This looks great, thanks! And thank you for the contribution!

[vyasr]

/merge