vim: Add support for temporary normal mode (ctrl-o) within insert mode (#19454)

Support has been added for the ctrl-o command within insert mode. Ctrl-o
is used to partially enter normal mode for 1 motion to then return back
into insert mode.

Release Notes:

- vim: Added support for `ctrl-o` in insert mode to enter temporary
normal mode

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/vim/src/insert.rs

@@ -3,10 +3,11 @@ use editor::{scroll::Autoscroll, Bias, Editor};
 use gpui::{actions, Action, ViewContext};
 use language::SelectionGoal;
 
-actions!(vim, [NormalBefore]);
+actions!(vim, [NormalBefore, TemporaryNormal]);
 
 pub fn register(editor: &mut Editor, cx: &mut ViewContext<Vim>) {
     Vim::action(editor, cx, Vim::normal_before);
+    Vim::action(editor, cx, Vim::temporary_normal);
 }
 
 impl Vim {
@@ -35,6 +36,11 @@ impl Vim {
 
         self.repeat(true, cx)
     }
+
+    fn temporary_normal(&mut self, _: &TemporaryNormal, cx: &mut ViewContext<Self>) {
+        self.switch_mode(Mode::Normal, true, cx);
+        self.temp_mode = true;
+    }
 }
 
 #[cfg(test)]