[WIP] DataFusion morselized scan

Signed-off-by: Adam Gutglick <adam@spiraldb.com>

Author: AdamGS

vortex-datafusion/src/persistent/mod.rs

@@ -26,6 +26,7 @@ mod access_plan;
 mod cache;
 mod format;
 pub mod metrics;
+pub mod morsel;
 mod opener;
 pub mod reader;
 mod sink;