[Feature] enhance service name mapping

[zrlw]

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Apache Dubbo Component

Java SDK (apache/dubbo)

Descriptions

Some times MetadataReport#getConfigItem will return a service name which is ended by a space character, MetadataServiceNameMapping#map will treat it as a different old service name. the service name mapping content will be updated to duplicated format such as "serviceA ,serviceA". Worse still, dubbo client will try to subscribe both "serviceA " and "serviceA", but "serviceA " will not be accepted by Nacos server and the subscription will be broken down by a illegal service name exception.

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