back,pusher,uploader: cleanup dependencies

Move typescript/ts-node-dev to dev dependencies, remove unused
dependencies.

uploader/package.json

@@ -37,18 +37,12 @@
   },
   "homepage": "https://github.com/thecodingmachine/workadventure#readme",
   "dependencies": {
-    "body-parser": "^1.19.0",
     "busboy": "^0.3.1",
     "debug": "^4.3.1",
-    "http-status-codes": "^1.4.0",
-    "iterall": "^1.3.0",
     "jsonwebtoken": "^8.5.1",
-    "multer": "^1.4.2",
     "mkdirp": "^1.0.4",
     "prom-client": "^12.0.0",
     "query-string": "^6.13.3",
-    "ts-node-dev": "^1.0.0-pre.44",
-    "typescript": "^3.8.3",
     "uWebSockets.js": "uNetworking/uWebSockets.js#v18.5.0",
     "uuidv4": "^6.0.7"
   },
@@ -64,6 +58,8 @@
     "@types/mkdirp": "^1.0.1",
     "@types/uuidv4": "^5.0.0",
     "eslint": "^6.8.0",
-    "jasmine": "^3.5.0"
+    "jasmine": "^3.5.0",
+    "ts-node-dev": "^1.0.0-pre.44",
+    "typescript": "^3.8.3"
   }
 }