packages/cli,dev-utils: add react hot loading support

packages/cli/package.json

@@ -29,6 +29,7 @@
     "backstage-cli": "bin/backstage-cli"
   },
   "dependencies": {
+    "@hot-loader/react-dom": "^16.13.0",
     "@lerna/package-graph": "^3.18.5",
     "@lerna/project": "^3.18.0",
     "@rollup/plugin-commonjs": "^11.0.2",
@@ -54,6 +55,7 @@
     "ora": "^4.0.3",
     "react": "^16.0.0",
     "react-dev-utils": "^10.2.0",
+    "react-hot-loader": "^4.12.21",
     "react-scripts": "^3.4.1",
     "recursive-readdir": "^2.2.2",
     "replace-in-file": "^6.0.0",