Monkeypatch each iframe (#716)

* `setTimeout` and `clearTimeout` are global functions. Think the window versions of them were for the following reason: https://stackoverflow.com/questions/60245787/

* Comments and extra test here helped me understand which inserts were expected and which are to be ignored

* Add a test for the style setProperty/removeProperty added in #671

* Add a test to ensure that listeners get added correctly in nested iframes - particularly important for those which rely on prototype monkeypatching

* Pass in the window object from the current iframe so that monkeypatching applies to all windows

* Satisfy typings

* No need to insert an iframe as there's one already set up for us

* Enable the console logger to also intercept log messages within iframes

* There's no tests for FontFace but presumably the monkeypatching here works similarly to the others

packages/rrweb/test/integration.test.ts

@@ -471,8 +471,15 @@ describe('record integration tests', function (this: ISuite) {
       console.trace('trace');
       console.warn('warn');
       console.clear();
+      const iframe = document.createElement('iframe');
+      document.body.appendChild(iframe);
     });
 
+    await page.frames()[1].evaluate(() => {
+      console.log('from iframe');
+    });
+
+
     const snapshots = await page.evaluate('window.snapshots');
     assertSnapshot(snapshots, __filename, 'log');
   });