fix: module error (#1087)

* fix: module error

refactor all suffix of bundled scripts with commonjs module from 'js' to cjs

error:
ReferenceError: exports is not defined in ES module scope
This file is being treated as an ES module because it has a '.js' file extension and '.../rrweb/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.

* update jest config files

packages/rrweb-snapshot/package.json

@@ -14,6 +14,7 @@
     "prepublish": "npm run typings && npm run bundle",
     "lint": "yarn eslint src"
   },
+  "type": "module",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/rrweb-io/rrweb.git"
@@ -23,7 +24,7 @@
     "snapshot",
     "DOM"
   ],
-  "main": "lib/rrweb-snapshot.js",
+  "main": "lib/rrweb-snapshot.cjs",
   "module": "es/rrweb-snapshot.js",
   "unpkg": "dist/rrweb-snapshot.js",
   "typings": "typings/index.d.ts",