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>

Cargo.toml

@@ -65,6 +65,7 @@ members = [
     "crates/gpui",
     "crates/gpui_macros",
     "crates/gpui_tokio",
+
     "crates/html_to_markdown",
     "crates/http_client",
     "crates/http_client_tls",
@@ -374,6 +375,7 @@ util = { path = "crates/util" }
 util_macros = { path = "crates/util_macros" }
 vim = { path = "crates/vim" }
 vim_mode_setting = { path = "crates/vim_mode_setting" }
+
 watch = { path = "crates/watch" }
 web_search = { path = "crates/web_search" }
 web_search_providers = { path = "crates/web_search_providers" }