packages,plugins: point types to src/ for development + add pre/post back cli commands

packages/backend-common/package.json

@@ -3,6 +3,7 @@
   "description": "Common functionality library for Backstage backends",
   "version": "0.1.1-alpha.5",
   "main": "dist",
+  "types": "src/index.ts",
   "private": false,
   "publishConfig": {
     "access": "public"
@@ -21,6 +22,8 @@
     "build": "backstage-cli build-cache -- tsc",
     "lint": "backstage-cli lint",
     "test": "backstage-cli test",
+    "prepack": "backstage-cli prepack",
+    "postpack": "backstage-cli postpack",
     "clean": "backstage-cli clean"
   },
   "dependencies": {