Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibJS/Tests/arguments-object.js

@@ -0,0 +1,15 @@
+test("basic arguments object", () => {
+    function foo() {
+        return arguments.length;
+    }
+    expect(foo()).toBe(0);
+    expect(foo(1)).toBe(1);
+    expect(foo(1, 2)).toBe(2);
+    expect(foo(1, 2, 3)).toBe(3);
+
+    function bar() {
+        return arguments[1];
+    }
+    expect(bar("hello", "friends", ":^)")).toBe("friends");
+    expect(bar("hello")).toBe(undefined);
+});