[TASK][EASY] Support Flink 1.18

[link3280]

Code of Conduct

• I agree to follow this project's Code of Conduct

Search before creating

• I have searched in the task list and found no similar tasks.

Mentor

• I have sufficient knowledge and experience of this task, and I volunteer to be the mentor of this task to guide contributors to complete the task.

Skill requirements

• Familiar with Flink SQL API

Background and Goals

• Bump Flink version to 1.18 while maintaining compatibility with Flink 1.16 and 1.17.

Implementation steps

• Add flink-1.18 profile
• Fix API compatibility problem
• Add cross-version tests in CI workflow

Additional context

No response

[YesOrNo828]

@link3280 @pan3793 Could you assign this task to me? I want to task a shot at this.

[pan3793]

@YesOrNo828 thanks. Flink 1.18 has started the RC process, it's also a good opportunity for us to test at this stage.

https://www.mail-archive.com/dev@flink.apache.org/msg70029.html

[YesOrNo828]

@pan3793 Thanks for your reminder. I found out that RC2 was created last day. I'll use this version to test.
https://lists.apache.org/thread/z4rr3w013xw5tr5qhntgfn2spck5sgx1

[pan3793]

Based on the real work of this task, I changed the task level from medium to easy.