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**What this PR does**:
- support protobuf
- some code refactoring, add `Serializer` interface and serialization layer

**What this PR fix**:
- registry url should not be encoded twice in `zookeeper/registry.go`

**Special notes for your reviewer**: file changes maybe too much, please be 
patient

**Does this PR introduce a user-facing change?**: No, all things are compatible.
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ps: protoc-gen-dubbogo plugin are in the 
[repo](https://github.com/skyitachi/protoc-gen-dubbogo)

[ Full content available at: https://github.com/apache/dubbo-go/pull/298 ]
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