Implements https://github.com/openai/codex/issues/392
When the user is in suggest or auto-edit mode and gets an approval
request, they now have an option in the `Shell Command` dialog to:
`Switch approval mode (v)`
That option brings up the standard `Switch approval mode` dialog,
allowing the user to switch into the desired mode, then drops them back
to the `Shell Command` dialog's `Allow command?` prompt, allowing them
to approve the current command and let the agent continue doing the rest
of what it was doing without interruption.
```
╭────────────────────────────────────────────────────────
│Shell Command
│
│$ apply_patch << 'PATCH'
│*** Begin Patch
│*** Update File: foo.txt
│@@ -1 +1 @@
│-foo
│+bar
│*** End Patch
│PATCH
│
│
│Allow command?
│
│ Yes (y)
│ Explain this command (x)
│ Edit or give feedback (e)
│ Switch approval mode (v)
│ No, and keep going (n)
│ No, and stop for now (esc)
╰────────────────────────────────────────────────────────╭────────────────────────────────────────────────────────
│ Switch approval mode
│ Current mode: suggest
│
│
│
│ ❯ suggest
│ auto-edit
│ full-auto
│ type to search · enter to confirm · esc to cancel
╰────────────────────────────────────────────────────────
```
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