feat: introducing rate-limiting on queries, mutations and most of the REST endpoints (HBE-111) (#46)

* feat: rate-limiting guard added and configured in app module

* feat: rate-limit annotation added in controllers and resolvers (query, mutation, not subscription)

* docs: added comments

packages/hoppscotch-backend/package.json

@@ -31,6 +31,7 @@
     "@nestjs/jwt": "^10.0.1",
     "@nestjs/passport": "^9.0.0",
     "@nestjs/platform-express": "^9.2.1",
+    "@nestjs/throttler": "^4.0.0",
     "@prisma/client": "^4.7.1",
     "apollo-server-express": "^3.11.1",
     "apollo-server-plugin-base": "^3.7.1",