public ProviderConfig getProviderConfig() {
        return providerConfig;
    }
SofaResourceFactory base on SingletonResource.

@author <a href="mailto:zhanggeng.zg@antfin.com">GengZhang</a>
@see org.jboss.resteasy.plugins.server.resourcefactory.SingletonResource
remoting/remoting-resteasy/src/main/java/com/alipay/sofa/rpc/server/rest/SofaResourceFactory.java