Validate return types of all behavior callbacks

[zachdaniel]

The steps for this:

For all callbacks on behaviour modules, we should switch from calling module.callback to calling Behaviour.callback(module, ...). These wrapper functions will do two things:

1. they will have type specs that allow for dialyzer to know what these functions return
2. they will match on the return types, and if they don't return a valid return value, they will instead raise an Ash.Error.Framework.InvalidReturnType explaining the bad return type.

This will make dialyzer more helpful throughout the project and also help users when they accidentally return the wrong value from a callback function.