Revisit the design of scheduler of coordinator

[zhanglei1949]

Currently for scheduled jobs, we could not get the job id and submit_dataloading_job function is called. Could we assign a unique job id when the API is called, and provide it as a parameter to the real loading service?

[github-actions]

/cc @zhanglei1949 @lidongze0629, this issus/pr has had no activity for for a long time, could you folks help to review the status ?
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