Enhance Dump Job

[cocodroid]

Feature Request

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Is your feature request related to a problem?

Describe the feature you would like.

1）if use elasticjob-lite, you can directly call SnapshotService#dumpJobDirectly to dump job. Some requirements may require direct exposure to the application.
2) In other scenarios, SnapshotService#dumpJob may be used to call other job service nodes to obtain Dump job information.For Example Admin Console,and so on. see #apache/shardingsphere-elasticjob-ui#147
3) Support API(JobOperateAPI#dump:(jobName, instanceIp, dumpPort)) to dump job.