Add GraalVM Reachability Metadata and corresponding nativeTest for Etcd integration

[linghengqian]

For #29052.

Changes proposed in this pull request:

• Add GraalVM Reachability Metadata and corresponding nativeTest for Etcd integration.
• Temporarily actively hosting GraalVM Reachability Metadata for io.netty:netty-transport-classes-epoll:4.1.99.Final.
• Further remove unnecessary metadata JSON entries.
• Change the port used by MySQL's nativeTest. On Windows 11 Professional with WSL2 enabled, 65107 is occupied, which is different from the behavior of Windows 11 Home and Student with WSL2 enabled. Dynamically defining YAML is one of the issues I'm tracking in profiles support global env value #29657.
• Turn on quick build mode for the Maven Profile of nativeTestInShardingSphere. This helps development by sacrificing the peak performance of Native Image for faster build speeds. Refer to https://medium.com/graalvm/graalvm-22-1-developer-experience-improvements-apple-silicon-builds-and-more-b7ac9a0f6066 .
• Set the buildArgs of -J-Xmx7g for the Maven Profile of nativeTestInShardingSphere to prevent Native Image build failures on low-performance devices with less than 10GB of available memory like Github Actions.
• Renames graalvm.version to graal-sdk.version. This property actually refers to the Maven module of org.graalvm.sdk:graal-sdk:21.2.0, not to the GraalVM CE version used by the developer.

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• I have made corresponding changes to the documentation.
• I have added corresponding unit tests for my changes.

[linghengqian]

• @RaigorJiang Is there any background in Update proxy document for Etcd. #29747 ? I don't understand why org.apache.shardingsphere:shardingsphere-cluster-mode-repository-etcd needs to exclude the dependency of io.vertx:vertx-grpc.