feat[array]: validity in display array

Signed-off-by: Joe Isaacs <[email protected]>

Author: joseph-isaacs

vortex-array/src/compute/zip.rs

@@ -329,7 +329,7 @@ mod tests {
         let result = zip(&const1, &const2, &mask).unwrap();
 
         insta::assert_snapshot!(result.display_tree(), @r"
-        root: vortex.varbinview(utf8?, len=100) nbytes=1.66 kB (100.00%)
+        root: vortex.varbinview(utf8?, len=100) nbytes=1.66 kB (100.00%) all_valid
           metadata: EmptyMetadata
           buffer (align=1): 29 B (1.75%)
           buffer (align=1): 28 B (1.69%)