feat: add memory tool (#10637)

Add a tool for memory to retrieve a full memory based on the memory ID

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

@@ -82,6 +82,7 @@ mod list_dir;
 mod list_models;
 mod live_cli;
 mod live_reload;
+mod memory_tool;
 mod model_info_overrides;
 mod model_overrides;
 mod model_switching;