remove mcp-server/src/mcp_protocol.rs and the code that depends on it (#2360)

codex-rs/mcp-server/tests/common/lib.rs

@@ -3,7 +3,15 @@ mod mock_model_server;
 mod responses;
 
 pub use mcp_process::McpProcess;
+use mcp_types::JSONRPCResponse;
 pub use mock_model_server::create_mock_chat_completions_server;
 pub use responses::create_apply_patch_sse_response;
 pub use responses::create_final_assistant_message_sse_response;
 pub use responses::create_shell_sse_response;
+use serde::de::DeserializeOwned;
+
+pub fn to_response<T: DeserializeOwned>(response: JSONRPCResponse) -> anyhow::Result<T> {
+    let value = serde_json::to_value(response.result)?;
+    let codex_response = serde_json::from_value(value)?;
+    Ok(codex_response)
+}