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/core/src/tools/parallel.rs

@@ -16,6 +16,7 @@ use crate::tools::context::AbortedToolOutput;
 use crate::tools::context::SharedTurnDiffTracker;
 use crate::tools::context::ToolPayload;
 use crate::tools::registry::AnyToolResult;
+use crate::tools::registry::ToolArgumentDiffConsumer;
 use crate::tools::router::ToolCall;
 use crate::tools::router::ToolCallSource;
 use crate::tools::router::ToolRouter;
@@ -52,6 +53,13 @@ impl ToolCallRuntime {
         self.router.find_spec(tool_name)
     }
 
+    pub(crate) fn create_diff_consumer(
+        &self,
+        tool_name: &codex_tools::ToolName,
+    ) -> Option<Box<dyn ToolArgumentDiffConsumer>> {
+        self.router.create_diff_consumer(tool_name)
+    }
+
     #[instrument(level = "trace", skip_all)]
     pub(crate) fn handle_tool_call(
         self,