Stream apply_patch changes (#17862)

Adds new events for streaming apply_patch changes from responses api.
This is to enable clients to show progress during file writes.

Caveat: This does not work with apply_patch in function call mode, since
that required adding streaming json parsing.

codex-rs/rollout/src/policy.rs

@@ -156,6 +156,7 @@ fn event_msg_persistence_mode(ev: &EventMsg) -> Option<EventPersistenceMode> {
         | EventMsg::BackgroundEvent(_)
         | EventMsg::StreamError(_)
         | EventMsg::PatchApplyBegin(_)
+        | EventMsg::PatchApplyUpdated(_)
         | EventMsg::TurnDiff(_)
         | EventMsg::GetHistoryEntryResponse(_)
         | EventMsg::UndoStarted(_)