chore: add funding to the package manifest (#6873)

adds the funding key to the manifest as the opencollective
per https://docs.npmjs.com/configuring-npm/package-json.html#funding

fixes #4649

package.json

@@ -150,6 +150,7 @@
   "bin": {
     "typeorm": "./cli.js"
   },
+  "funding": "https://opencollective.com/typeorm",
   "collective": {
     "type": "opencollective",
     "url": "https://opencollective.com/typeorm",