[flink ]module errorcode optimization and documentation

[binbinCheng]

[flink ]module errorcode optimization and documentation

Example：

documentation（文档）

Error code optimization（错误码优化）

Classes that need to be optimized（需要优化的类）

class	path
ExecutorInitException	org.apache.linkis.engineconnplugin.flink.exception.ExecutorInitException
FlinkInitFailedException	org.apache.linkis.engineconnplugin.flink.exception.FlinkInitFailedException
JobExecutionException	org.apache.linkis.engineconnplugin.flink.exception.JobExecutionException
SqlExecutionException	org.apache.linkis.engineconnplugin.flink.exception.SqlExecutionException
SqlParseException	org.apache.linkis.engineconnplugin.flink.exception.SqlParseException

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