vim: Allow search with operators & visual mode (#10226)

Fixes: #4346

Release Notes:

- vim: Add search motions (`/,?,n,N,*,#`) in visual modes and as targets
for operators like `d`,`c`,`y`
([#4346](https://github.com/zed-industries/zed/issues/4346)).

crates/workspace/src/searchable.rs

@@ -18,9 +18,10 @@ pub enum SearchEvent {
     ActiveMatchChanged,
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug, Default)]
 pub enum Direction {
     Prev,
+    #[default]
     Next,
 }