Add open vim keymap command (#9953)

Release Notes:

- Added a `vim: open default keymap` command to show the default Vim
keymap ([#8593](https://github.com/zed-industries/zed/issues/8593)).

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/vim/src/vim.rs

@@ -67,7 +67,15 @@ struct Number(usize);
 
 actions!(
     vim,
-    [Tab, Enter, Object, InnerObject, FindForward, FindBackward]
+    [
+        Tab,
+        Enter,
+        Object,
+        InnerObject,
+        FindForward,
+        FindBackward,
+        OpenDefaultKeymap
+    ]
 );
 
 // in the workspace namespace so it's not filtered out when vim is disabled.
@@ -133,6 +141,14 @@ fn register(workspace: &mut Workspace, cx: &mut ViewContext<Workspace>) {
         })
     });
 
+    workspace.register_action(|_: &mut Workspace, _: &OpenDefaultKeymap, cx| {
+        cx.emit(workspace::Event::OpenBundledFile {
+            text: settings::vim_keymap(),
+            title: "Default Vim Bindings",
+            language: "JSON",
+        });
+    });
+
     normal::register(workspace, cx);
     insert::register(workspace, cx);
     motion::register(workspace, cx);