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/normal/search.rs

@@ -139,6 +139,11 @@ impl Vim {
                         options |= SearchOptions::REGEX;
                     }
                     search_bar.set_search_options(options, cx);
+                    let prior_mode = if self.temp_mode {
+                        Mode::Insert
+                    } else {
+                        self.mode
+                    };
 
                     self.search = SearchState {
                         direction,
@@ -146,7 +151,7 @@ impl Vim {
                         initial_query: query,
                         prior_selections,
                         prior_operator: self.operator_stack.last().cloned(),
-                        prior_mode: self.mode,
+                        prior_mode,
                     }
                 });
             }