Delegate review to codex instance (#5572)

In this PR, I am exploring migrating task kind to an invocation of
Codex. The main reason would be getting rid off multiple
`ConversationHistory` state and streamlining our context/history
management.

This approach depends on opening a channel between the sub-codex and
codex. This channel is responsible for forwarding `interactive`
(`approvals`) and `non-interactive` events. The `task` is responsible
for handling those events.

This opens the door for implementing `codex as a tool`, replacing
`compact` and `review`, and potentially subagents.

One consideration is this code is very similar to `app-server` specially
in the approval part. If in the future we wanted an interactive
`sub-codex` we should consider using `codex-mcp`

codex-rs/core/tests/suite/client.rs

@@ -675,6 +675,7 @@ async fn azure_responses_request_includes_store_and_reasoning_ids() {
         effort,
         summary,
         conversation_id,
+        codex_protocol::protocol::SessionSource::Exec,
     );
 
     let mut prompt = Prompt::default();