feat: Add support for tabular/csv data input.

crates/pikl-core/src/model/traits.rs

@@ -66,6 +66,17 @@ pub trait Menu: Send + 'static {
             })
             .collect()
     }
+
+    /// Get the column values for a filtered item, if table
+    /// mode is active. Returns None when no column config is set.
+    fn column_values(&self, _filtered_index: usize) -> Option<Vec<String>> {
+        None
+    }
+
+    /// Get the column config, if one is set.
+    fn column_config(&self) -> Option<&crate::model::column::ColumnConfig> {
+        None
+    }
 }
 
 /// Extension of [`Menu`] with mutation methods. Required by