Support automatic declaration for List<Binding> as well as others

I had used an enum with BindingBuilder to create a list of Binding s that I need declared. I wanted to have the logic of which routing keys isolated from the code that actually declares the bindings to make it easier to modify in the future.

Without support for List<Binding> I had to have several different @Bean each returning a single Binding. I assume this could be useful for other entities like Queue and Exchange.