LibJS: Add yearOfWeek calendar methods and properties

This is a normative change in the Temporal spec.

See:
- 7fa4d18
- caa941d

Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.prototype.yearOfWeek.js

@@ -0,0 +1,14 @@
+describe("correct behavior", () => {
+    test("basic functionality", () => {
+        const plainDateTime = new Temporal.PlainDateTime(2023, 1, 1);
+        expect(plainDateTime.yearOfWeek).toBe(2022);
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.PlainDateTime object", () => {
+        expect(() => {
+            Reflect.get(Temporal.PlainDateTime.prototype, "yearOfWeek", "foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainDateTime");
+    });
+});