Add support for multiple servers

[Martinsos]

You might want to split work onto multiple servers: most often because you have some heavy workload that you want to put onto a separate server that will be a microservice of a kind. Maybe there are some other use cases also, we should explore.

In such case, we could offer some easy support for this in Wasp. Ability to have more than one server, and then assign operations, jobs and similar to a specific server instead of all of them being assigned to the default server. Sounds pretty cool to me!

This potentially pulls some other features in, like queueing, deployment (of multiple servers), auth between the servers, ... . Simple in idea, and should be simple to use, but requires careful design and consideration.

Here is a use case where this might be a nice easy solution: https://discord.com/channels/686873244791210014/1265345677454606336/1265345677454606336