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/custom-@@hasInstance.js

@@ -0,0 +1,9 @@
+test("basic functionality", () => {
+    function Foo() {}
+    Object.defineProperty(Foo, Symbol.hasInstance, {
+        value: instance => instance === 2,
+    });
+
+    expect(new Foo() instanceof Foo).toBeFalse();
+    expect(2 instanceof Foo).toBeTrue();
+});