[Feature-38938][core][admin][web] Flink SQL task Support insert result preview #3896
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Purpose of the pull request
This pull request is aimed at implementing the feature of insert result preview.
Brief change log
A customized connector class is added to write insert result into accumulator.
A mock statement explainer is added to convert insert statement into mock.
Some related changes of model core and admin.
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: