[app-server] add new RawResponseItem v2 event (#8152)
``codex/event/raw_response_item` (v1) -> `rawResponseItem/completed`
(v1).
test client log:
````
< {
< "method": "codex/event/raw_response_item",
< "params": {
< "conversationId": "019b29f7-b089-7140-a535-3fe681562c15",
< "id": "0",
< "msg": {
< "item": {
< "arguments": "{\"command\":\"sed -n '1,160p' Cargo.toml\",\"workdir\":\"/Users/celia/code/codex/codex-rs\"}",
< "call_id": "call_DrqbdB2jPxezPWc19YVEEt3h",
< "name": "shell_command",
< "type": "function_call"
< },
< "type": "raw_response_item"
< }
< }
< }
< {
< "method": "rawResponseItem/completed",
< "params": {
< "item": {
< "arguments": "{\"command\":\"sed -n '1,160p' Cargo.toml\",\"workdir\":\"/Users/celia/code/codex/codex-rs\"}",
< "call_id": "call_DrqbdB2jPxezPWc19YVEEt3h",
< "name": "shell_command",
< "type": "function_call"
< },
< "threadId": "019b29f7-b089-7140-a535-3fe681562c15",
< "turnId": "0"
< }
< }
```
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