Separate all automatic algorithm selection functionalities from their packages

[prbzrg]

We can either move them all to one package or create separate packages for each of them. This will help reduce loading times and dependencies in the packages that have them. Foremost, it breaks some codes, but let's ignore it for now. Does it benefit users in general?

[ChrisRackauckas]

The default handling is already in a separate package (here). But that's going to change soon, I'm going to redesign it a bit and it'll reduce loading times.