Addons: include jscodeshift, recast for rewriting imports

We need jscodeshift for codemods in general, and we need recast so we
can use the TS parser (to get the right behavior on decorators).

Author: chriskrycho

package.json

@@ -29,6 +29,7 @@
     "ember-template-recast": "^3.3.0",
     "fs-extra": "^7.0.1",
     "glob": "^7.1.4",
+    "jscodeshift": "^0.10.0",
     "nopt": "^4.0.1",
     "remove-empty-directories": "^0.0.1",
     "yargs": "^15.3.1"
@@ -37,6 +38,7 @@
     "assert-diff": "^2.0.3",
     "fixturify": "^1.0.1",
     "mocha": "^6.1.1",
+    "recast": "^0.19.1",
     "release-it": "^13.6.0",
     "release-it-lerna-changelog": "^2.3.0"
   },