Explore Backend Options and settle on one.

[kaljitism]

We have finalized that we will be using Cloud Run for hosting our app. We need a scalable backend as well and following are the options -

1. Dart Shelf - Low Level, Scalable, Supported by Dart Team, No Docs
2. Dart Frog - Minimalistic, Easy, Good Docs, Unsure about Scalability
3. Serverpod - Promising Dart Backend, Excellent Support for Flutter, Recently Funded
4. Functions - For compute intensive tasks, generally unrelated to architecture

The purpose of this study would be to study and finalize on one or multiuple solutions based on application needs and feasibility of a single developer working on the application for a long time.