[Feature] To enhance the ReferenceBean object to be a generic Spring Bean on @Reference injection

[mercyblitz]

It assumes that A field that was declared in a Spring Bean annotated @Reference, The Dubbo Framework will generate an instance of ReferenceBean and inject into this field by Java reflection, rather than as a generic Spring Bean, that means, the newly generated instance can't be referenced by other places, thus, it's required to enhance this object as a Spring Bean in order to get it easily.

At the same time, @Reference should add a new attribute named "id", which is optional and identifies the different ReferenceBean.