DubboGrpcGenerator output java code not format.

- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [x] I have searched the [release notes](https://github.com/apache/dubbo/releases) of this repository and believe that this is not a duplicate.

## Describe the feature


```xml
2.7.7
3.1.10
4.3.16.RELEASE
1.34.1
3.21.9
./
3.21.9

org.xolstice.maven.plugins
protobuf-maven-plugin
0.6.1

com.google.protobuf:protoc:${protoc.version}:exe:${os.detected.classifier}

grpc-java
io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}

build/generated/source/proto/main/java
false


dubbo-grpc
org.apache.dubbo
dubbo-compiler
${dubbo.compiler.version}
org.apache.dubbo.gen.grpc.DubboGrpcGenerator



${protoc.third_party}





compile
compile-custom
test-compile
test-compile-custom




```

The java code format is confusing, can it be formatted and then generated?