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### _Why are the changes needed?_
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Introduce a session-level configuration `operation.plan.only.mode` to change ExecuteStatement to PlanOnlyStatement,
PlanOnlyStatement will only parse, analyze or optimize the statements instead of executing them.
This feature could run all Spark SQLs to verify the semantic compatibility without having side effects, which is very useful for testing, migrating without query rewrite.
This is similar to the `explain` command
### _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
- [ ] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1060 from yaooqinn/1059.
Closes#1059
e0aa1060 [Kent Yao] [KYUUBI #1059] Add Plan Only Operations
4104aa42 [Kent Yao] [KYUUBI #1059] Add Plan Only Operations
aae52f26 [Kent Yao] [KYUUBI #1059] Add Plan Only Operations
575dbf8f [Kent Yao] [KYUUBI #1059] Add Plan Only Operations
Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>
4f11b51673