[Rust Frontend] Split engine core DTOs into separate modules (#47265)

Signed-off-by: Bugen Zhao <i@bugenzhao.com>

rust/src/parser/python/src/lib.rs

@@ -231,9 +231,10 @@ fn _rust_tool_parser(m: &Bound<'_, PyModule>) -> PyResult<()> {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use serde_json::json;
 
+    use super::*;
+
     fn with_python<R>(f: impl for<'py> FnOnce(Python<'py>) -> R) -> R {
         Python::initialize();
         Python::attach(f)