fix: restore cleanup-after-each and include a deprecation warning

ref: #433

Author: Kent C. Dodds

cleanup-after-each.js

@@ -0,0 +1,4 @@
+console.warn(
+  'The module `@testing-library/react/cleanup-after-each` has been deprecated and no longer does anything (it is not needed). You no longer need to import this module and can safely remove any import or configuration which imports this module',
+)
+/* eslint no-console:0 */

package.json

@@ -24,6 +24,7 @@
   "files": [
     "dist",
     "typings",
+    "cleanup-after-each.js",
     "pure.js"
   ],
   "keywords": [