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/du.rs

@@ -50,7 +50,7 @@ fn test_du_flag_max_depth() {
 #[case("a[bc]d")]
 #[case("a][c")]
 fn du_files_with_glob_metachars(#[case] src_name: &str) {
-    Playground::setup("umv_test_16", |dirs, sandbox| {
+    Playground::setup("du_test_16", |dirs, sandbox| {
         sandbox.with_files(vec![EmptyFile(src_name)]);
 
         let src = dirs.test().join(src_name);
@@ -82,3 +82,21 @@ fn du_files_with_glob_metachars(#[case] src_name: &str) {
 fn du_files_with_glob_metachars_nw(#[case] src_name: &str) {
     du_files_with_glob_metachars(src_name);
 }
+
+#[test]
+fn du_with_multiple_path() {
+    let actual = nu!(cwd: "tests/fixtures", "du cp formats | get path | path basename");
+    assert!(actual.out.contains("cp"));
+    assert!(actual.out.contains("formats"));
+    assert!(!actual.out.contains("lsp"));
+    assert!(actual.status.success());
+
+    // report errors if one path not exists
+    let actual = nu!(cwd: "tests/fixtures", "du cp asdf | get path | path basename");
+    assert!(actual.err.contains("directory not found"));
+    assert!(!actual.status.success());
+
+    // du with spreading empty list should returns nothing.
+    let actual = nu!(cwd: "tests/fixtures", "du ...[] | length");
+    assert_eq!(actual.out, "0");
+}

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");
+    })
+}