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### _Why are the changes needed?_
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ExecuteStatement of Flink engine now supports QueryOperation only. We can extend it to support more operations that Flink Executor already supports. e.g. ShowTableOperation,CreateTableOperation, ExplainOperation.
This is a sub-task of KPIP-2 #1322 .
### _How was this patch tested?_
- [X] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [X] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1693 from link3280/feature/extend_flink_operation.
Closes#1681
520d1f42 [Paul Lin] [KYUUBI #1681] Extend Flink ExecuteStatement to support more operations
Authored-by: Paul Lin <paullin3280@gmail.com>
Signed-off-by: yanghua <yanghua1127@gmail.com>
e2fb7d6f9b