feat: Add config option to enable converting CSV to columnar #871
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Which issue does this PR close?
N/A
Rationale for this change
Allow Comet to accelerate queries that read from CSV files.
What changes are included in this PR?
Add a config option to enable converting CSV file scans into Arrow format so that Comet can operate on the rest of the query.
How are these changes tested?
Simple test added. The feature is disabled by default and should only be enabled once we have more comprehensive tests.