Add ItemStarted/ItemCompleted events for UserInputItem (#5306)

Adds a new ItemStarted event and delivers UserMessage as the first item
type (more to come).


Renames `InputItem` to `UserInput` considering we're using the `Item`
suffix for actual items.

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

@@ -5,10 +5,10 @@ use codex_core::features::Feature;
 use codex_core::model_family::find_family_for_model;
 use codex_core::protocol::AskForApproval;
 use codex_core::protocol::EventMsg;
-use codex_core::protocol::InputItem;
 use codex_core::protocol::Op;
 use codex_core::protocol::SandboxPolicy;
 use codex_protocol::config_types::ReasoningSummary;
+use codex_protocol::user_input::UserInput;
 use core_test_support::assert_regex_match;
 use core_test_support::responses::ev_apply_patch_function_call;
 use core_test_support::responses::ev_assistant_message;
@@ -35,7 +35,7 @@ async fn submit_turn(test: &TestCodex, prompt: &str, sandbox_policy: SandboxPoli
 
     test.codex
         .submit(Op::UserTurn {
-            items: vec![InputItem::Text {
+            items: vec![UserInput::Text {
                 text: prompt.into(),
             }],
             final_output_json_schema: None,