Pass TurnContext around instead of sub_id (#5421)

Today `sub_id` is an ID of a single incoming Codex Op submition. We then
associate all events triggered by this operation using the same
`sub_id`.

At the same time we are also creating a TurnContext per submission and
we'd like to start associating some events (item added/item completed)
with an entire turn instead of just the operation that started it.

Using turn context when sending events give us flexibility to change
notification scheme.

codex-rs/core/src/apply_patch.rs

@@ -36,7 +36,6 @@ pub(crate) struct ApplyPatchExec {
 pub(crate) async fn apply_patch(
     sess: &Session,
     turn_context: &TurnContext,
-    sub_id: &str,
     call_id: &str,
     action: ApplyPatchAction,
 ) -> InternalApplyPatchInvocation {
@@ -62,7 +61,7 @@ pub(crate) async fn apply_patch(
             // that similar patches can be auto-approved in the future during
             // this session.
             let rx_approve = sess
-                .request_patch_approval(sub_id.to_owned(), call_id.to_owned(), &action, None, None)
+                .request_patch_approval(turn_context, call_id.to_owned(), &action, None, None)
                 .await;
             match rx_approve.await.unwrap_or_default() {
                 ReviewDecision::Approved | ReviewDecision::ApprovedForSession => {