Payment plugin fixes (#396)

* Avoid deducting from free quota for queries with unconfigured rates

* Check query selections on an introspection query

* Update comment

packages/cli/package.json

@@ -21,6 +21,7 @@
     "debug": "^4.3.1",
     "express": "^4.18.2",
     "graphql-subscriptions": "^2.0.0",
+    "pluralize": "^8.0.0",
     "reflect-metadata": "^0.1.13",
     "typeorm": "0.2.37",
     "yargs": "^17.0.1"
@@ -28,6 +29,7 @@
   "devDependencies": {
     "@types/express": "^4.17.14",
     "@types/node": "16.11.7",
+    "@types/pluralize": "^0.0.29",
     "@types/yargs": "^17.0.0",
     "@typescript-eslint/eslint-plugin": "^5.47.1",
     "@typescript-eslint/parser": "^5.47.1",