making ls and du supports rest parameters. (#12327)

# Description
Close: #12147
Close: #11796 

About the change: it make pattern handling into a function:
`ls_for_one_pattern`(for ls), `du_for_one_pattern`(for du). Then
iterates on user input pattern, call these core function, and chaining
these iterator to one pipelinedata.

crates/nu-command/tests/commands/ls.rs

@@ -733,3 +733,29 @@ fn list_with_tilde() {
         assert!(actual.out.contains("~tilde"));
     })
 }
+
+#[test]
+fn list_with_multiple_path() {
+    Playground::setup("ls_multiple_path", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("f1.txt"),
+            EmptyFile("f2.txt"),
+            EmptyFile("f3.txt"),
+        ]);
+
+        let actual = nu!(cwd: dirs.test(), "ls f1.txt f2.txt");
+        assert!(actual.out.contains("f1.txt"));
+        assert!(actual.out.contains("f2.txt"));
+        assert!(!actual.out.contains("f3.txt"));
+        assert!(actual.status.success());
+
+        // report errors if one path not exists
+        let actual = nu!(cwd: dirs.test(), "ls asdf f1.txt");
+        assert!(actual.err.contains("directory not found"));
+        assert!(!actual.status.success());
+
+        // ls with spreading empty list should returns nothing.
+        let actual = nu!(cwd: dirs.test(), "ls ...[] | length");
+        assert_eq!(actual.out, "0");
+    })
+}