[Optimization-3917][core] Optimize explain and add test #3918
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Purpose of the pull request
1.Optimize explain sql to support select statement, etc.
2.Optimize get stream graph to support select statement, etc.
3.Optimize get job plan info to support select statement, etc.
4.Optimize get lineage to support select statement, etc.
5.Add test to check the new feature of statements.
6.Optimize debug task.
7.Optimize execution step tp support sort execution
Brief change log
Verify this pull request
This pull request is code cleanup without any test coverage.
(or)
This pull request is already covered by existing tests, such as (please describe tests).
(or)
This change added tests and can be verified as follows: