Option to pass in client instead of clientPromise to MongoDB Adapter

[AnishDe12020]

Title

Option to pass in client instead of clientPromise to MongoDB Adapter

How to reproduce ☕️

Not a bug report.

Your question/bug report 📓

Currently, the MongoDB Adapter takes in a clientPromise which is awaited on the adapter and a connection is established. However, if I want to use MongoDB in my application for anything other than auth, I need to open another connection to the database. It would be helpful if we could (or at least had the option to) pass in a MongoClient object to the adapter.

Contributing 🙌🏽

Yes, I am

[balazsorban44]

This is taken from the recommendations in the Next.js example repository: https://github.com/vercel/next.js/blob/canary/examples/with-mongodb/lib/mongodb.js

This should actually hold the connection if you use it in other places compared to what you are suggesting, where the adapter would need to create its own connection.