ref(ember): Add type definitions for Ember (#3531)

Since we aren't running 'prepublishOnly' via Lerna, Ember-cli-typescript's precompile wasn't getting called. A pre and post publish call will temporarily create the definitions for publishing and remove them afterwards. This is required since .ts files can't be included in the app folder in Ember since they get merged as-is into a project file structure.

Author: k-fish

package.json

@@ -12,7 +12,8 @@
     "test": "lerna run --stream --concurrency 1 --sort test",
     "codecov": "codecov",
     "pack:changed": "lerna run pack --since",
-    "postpublish": "make publish-docs"
+    "prepublishOnly": "lerna run --stream --concurrency 1 prepublishOnly",
+    "postpublish": "make publish-docs && lerna run --stream --concurrency 1 postpublish"
   },
   "volta": {
     "node": "10.18.1",

packages/ember/tsconfig.json

@@ -24,5 +24,5 @@
       "*": ["types/*"]
     }
   },
-  "include": ["app/**/*", "addon/**/*", "tests/**/*", "types/**/*", "test-support/**/*", "addon-test-support/**/*"]
+  "include": ["app/**/*", "addon/**/*", "types/**/*", "addon-test-support/**/*"]
 }