Record and replay nested stylesheet rules (#666)

* fix typo

* record nested style rules

* Replay nested style rules

* handle index array in replayer

Co-authored-by: Justin Halsall <Juice10@users.noreply.github.com>

packages/rrweb/package.json

@@ -53,7 +53,7 @@
     "ignore-styles": "^5.0.1",
     "inquirer": "^6.2.1",
     "jest-snapshot": "^23.6.0",
-    "jsdom": "^16.6.0",
+    "jsdom": "^17.0.0",
     "jsdom-global": "^3.0.2",
     "mocha": "^5.2.0",
     "prettier": "2.2.1",