[Feature]: [flink] when partition value is null, we should write the record to the partition default configured.

[Aireed]

Description

1、Now, Flink arctic sink will write records whose partition value is null to a null partition. For users, different app needs different action!
some one want to send records whose partition value to 1970-07-01 partition for sort, some cdh users want to write to the hive default partition!

so, we may supply a catalog-level configuration to support user to configure the default parition when we encounted records whose parition value are null.

Use case/motivation

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Describe the solution

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Related issues

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Are you willing to submit a PR?

• [ ] Yes I am willing to submit a PR!

Code of Conduct

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