Refactor createPouringPartSpec method to simplify main body.
Added CreatePouringPartSpecResponse response for addPouringPartSpec method
Orgnized imports
Updated typo
Fixed bug: expected to return List<AdditiveTO> but return List<Additive> when transfering Entity to TO

Solution:
Add bindingTyp = BindingTypeEnum.Entity and embeddedType = XXTO.class