SNOW-747896: Clean up the first chunk of data that has been previously used #772
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Description
Issue 300: https://github.com/snowflakedb/snowflake-sdks-drivers-issues-teamwork/issues/300
The data chunk at index 0 is not cleaned up until the end when reset() is called in rows.go and consumes memory.
This PR cleans it up by freeing the chunk before reading the next chunk.
Checklist
make fmtto fix inconsistent formatsmake lintto get lint errors and fix all of them