vim: Fix escape key switching back to default mode instead of normal mode (#31843)

Closes #31728

This PR introduced new setting `"helix_mode"`. Enabling which will
enable the `vim_mode` along with `helix` behavior.

This solves issue where `vim`'s `default_mode` was being used to switch
between mode instead of opening in `default_mode`.

When `helix_mode` is enabled switcing to `Normal mode` will now switch
to `HelixNormal`


Release Notes:

- Fixed - escape key not switching to normal mode when default_mode is
insert
- Added - `helix_mode` setting to enable/disable helix key bindings

---------

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

crates/vim/src/insert.rs

@@ -2,6 +2,8 @@ use crate::{Vim, state::Mode};
 use editor::{Bias, Editor, scroll::Autoscroll};
 use gpui::{Action, Context, Window, actions};
 use language::SelectionGoal;
+use settings::Settings;
+use vim_mode_setting::HelixModeSetting;
 
 actions!(vim, [NormalBefore, TemporaryNormal]);
 
@@ -36,7 +38,11 @@ impl Vim {
                     });
                 });
             });
-            self.switch_mode(self.default_mode(cx), false, window, cx);
+            if HelixModeSetting::get_global(cx).0 {
+                self.switch_mode(Mode::HelixNormal, false, window, cx);
+            } else {
+                self.switch_mode(Mode::Normal, false, window, cx);
+            }
             return;
         }