gaussdbwriter 插件包名问题

在 gaussdbwriter/src/main/java/com/alibaba/datax/plugin/reader/gaussdbwriter/GaussDbWriter.java 第一行：

```java
package com.alibaba.datax.plugin.reader.gaussdbwriter;
```

打包后出现异常：

```
com.alibaba.datax.common.exception.DataXException: Code:[Framework-02], Description:[DataX引擎运行过程出错，具体原因请参看DataX运行结束时的错误诊断信息 .]. - java.lang.ClassNotFoundException: com.alibaba.datax.plugin.writer.gaussdbwriter.GaussDbWriter$Job
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:476)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:594)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:527)
at com.alibaba.datax.core.util.container.LoadUtil.loadPluginClass(LoadUtil.java:173)
at com.alibaba.datax.core.util.container.LoadUtil.loadJobPlugin(LoadUtil.java:93)
at com.alibaba.datax.core.job.JobContainer.initJobWriter(JobContainer.java:691)
at com.alibaba.datax.core.job.JobContainer.init(JobContainer.java:304)
at com.alibaba.datax.core.job.JobContainer.start(JobContainer.java:113)
at com.alibaba.datax.core.Engine.start(Engine.java:93)
at com.alibaba.datax.core.Engine.entry(Engine.java:175)
at com.alibaba.datax.core.Engine.main(Engine.java:208)
```

修改为：
```java
package com.alibaba.datax.plugin.writer.gaussdbwriter;
```
后重新打包就可以正常运行

Open gaussdbwriter/src/main/java/com/alibaba/datax/plugin/reader/gaussdbwriter/GaussDbWriter.java and compare its package declaration with the writer class name in the ClassNotFoundException. Correct the package declaration, rebuild the plugin, and verify that the GaussDbWriter job loads without the reported exception.

Written by the indexing model from the issue text.