LibJS: Implement (mostly) String.prototype.match

JavaScript has a couple of different ways to run a regular expression
on a string. This adds support for one more. :^)

Userland/Libraries/LibJS/Tests/builtins/String/String.prototype.match.js

@@ -0,0 +1,6 @@
+test("basic functionality", () => {
+    expect(String.prototype.match).toHaveLength(1);
+
+    expect("hello friends".match(/hello/)).not.toBeNull();
+    expect("hello friends".match(/enemies/)).toBeNull();
+});