[C++] Refactor scan_node to introduce support for scan tasks
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#36,916
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Beansprucht von @westonpace
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Component: C++
Type: enhancement
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### Describe the enhancement requested
This is a prerequisite task for adding support for parquet to the new scan node. The current implementation has two problems that I am seeking to improve. It is too focused on CSV and did not account for a row-group-like concept. The second is that the sequencing logic is scattered throughout the scan node implementation which makes it difficult to follow.
### Component(s)
C++
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