setup webserver for flipper-server

Summary:
This sets up the metro bundler for flipper-server, to be able to serve the front end.

Note that this is a setup that is only relevant for development purposes

Done in this diff:

* setup metro
* setup fast refresh
* setup nodemon to be able to refresh on server changes

Not done in this diff

* Setup FlipperServerImpl in the flipper-server
* Load flipper-ui-core in flipper-ui-browser
* Load plugins
* Support options, env vars etc etc
* Make flipper-server stand alone (it is largely self contained, but still requires some static resources like theming)

Reviewed By: passy, aigoncharov

Differential Revision: D32626137

fbshipit-source-id: 47f580356ddf0993392d3b583082b187661727e9

desktop/flipper-server/package.json

@@ -9,13 +9,27 @@
   "types": "lib/index.d.ts",
   "license": "MIT",
   "bugs": "https://github.com/facebook/flipper/issues",
-  "dependencies": {},
-  "devDependencies": {},
+  "dependencies": {
+    "chalk": "^4.1.2",
+    "express": "^4.15.2",
+    "flipper-pkg-lib": "0.0.0",
+    "fs-extra": "^9.0.0",
+    "p-filter": "^2.1.0",
+    "socket.io": "^4.3.1"
+  },
+  "devDependencies": {
+    "@types/express": "^4.17.13",
+    "metro": "^0.66.2",
+    "nodemon": "^2.0.15",
+    "ts-node": "^9.1.1",
+    "typescript": "^4.4.4"
+  },
   "peerDependencies": {},
   "scripts": {
     "reset": "rimraf lib *.tsbuildinfo",
     "build": "tsc -b",
-    "prepack": "yarn reset && yarn build"
+    "prepack": "yarn reset && yarn build",
+    "start": "cross-env NODE_ENV=development nodemon --watch './src/*.tsx' --exec '../ts-node' src/index.tsx"
   },
   "files": [
     "lib/**/*"