Simple Pub/Sub messaging

I know that the team is hard at work on the [Realtime feature](

I believe that Pub/Sub messaging would be a somewhat simple feature to add into Appwrite, yet it would provide a ton of value to users.

Even a basic implementation with only support for subscribing to channels and publishing messages would be powerful. Additional features such as getting a list of channels would be a nice to have.

Example client SDK usage:


Since Appwrite already uses Redis, we could leverage it's Pub/Sub capabilities. Meaning Appwrite only has to provide a kind of 'wrapper' around the Redis Pub/Sub that enables client interaction.