Bind editor::Rewrap to alt-q (#17953)

This PR adds a keybinding for the `editor: rewrap` command.

It is bound to `alt-q`, by default. In Vim mode, it is bound to `g q`.

Release Notes:

- N/A

assets/keymaps/vim.json

@@ -124,6 +124,7 @@
       "g i": "vim::InsertAtPrevious",
       "g ,": "vim::ChangeListNewer",
       "g ;": "vim::ChangeListOlder",
+      "g q": "editor::Rewrap",
       "shift-h": "vim::WindowTop",
       "shift-m": "vim::WindowMiddle",
       "shift-l": "vim::WindowBottom",