message: indexer-service: Fix types hint in package.json
diff: "version": "0.0.0",
  "description": "Indexer service",
  "main": "dist/index.js",
  + "types": "dist/index.d.ts",
  "repository": "https://github.com/graphprotocol/indexer",
  "author": "Graph Protocol",
  "private": false,
  