[Optimization][CDCSOURCE] Optimize the logical type acquisition method of cdcsource

[Zzm0809]

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• I had searched in the issues and found no similar optimization requirement.

Description

mysql table info

generate flinkddl

The generated flinkddl does not have a length, which may cause potential unknown problems.

You can get the asSerializableString of Flink LogicalType during conversion to get the complete flink type to avoid this problem.

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

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

[github-actions]

Hello @Zzm0809, this issue is about CDC/CDCSOURCE, so I assign it to @aiwenmo. If you have any questions, you can comment and reply.

你好 @Zzm0809, 这个 issue 是关于 CDC/CDCSOURCE 的，所以我把它分配给了 @aiwenmo。如有任何问题，可以评论回复。