Indicates that an annotated class is a "Service", originally defined by Domain-Driven
Design (Evans, 2003) as "an operation offered as an interface that stands alone in the
model, with no encapsulated state."
May also indicate that a class is a "Business Service Facade" (in the Core J2EE
patterns sense), or something similar. This annotation is a general-purpose stereotype
and individual teams may narrow their semantics and use as appropriate.
This annotation serves as a specialization of
allowing for implementation classes to be autodetected through classpath scanning.