feat[vector]: fill in VectorMut::with_capacity (#5173)

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

Author: joseph-isaacs

vortex-vector/src/vector_mut.rs

@@ -66,9 +66,10 @@ impl VectorMut {
             DType::Decimal(decimal_dtype, _) => {
                 DecimalVectorMut::with_capacity(decimal_dtype, capacity).into()
             }
-            DType::Utf8(_) | DType::Binary(_) | DType::List(..) | DType::Extension(_) => {
-                vortex_panic!("Unsupported dtype for VectorMut")
-            }
+            DType::Utf8(..) => StringVectorMut::with_capacity(capacity).into(),
+            DType::Binary(..) => BinaryVectorMut::with_capacity(capacity).into(),
+            DType::Extension(ext) => VectorMut::with_capacity(ext.storage_dtype(), capacity),
+            DType::List(..) => todo!("vector mut with capacity"),
         }
     }
 }