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>

assets/keymaps/vim.json

@@ -304,7 +304,8 @@
       "ctrl-q": ["vim::PushOperator", { "Literal": {} }],
       "ctrl-shift-q": ["vim::PushOperator", { "Literal": {} }],
       "ctrl-r": ["vim::PushOperator", "Register"],
-      "insert": "vim::ToggleReplace"
+      "insert": "vim::ToggleReplace",
+      "ctrl-o": "vim::TemporaryNormal"
     }
   },
   {