[FLINK-37737] Add support for GaussDB database type

[Tyhoning]

Add support for GaussDB database type, So you can use Flink jdbc to write to the gaussdb database now。

[boring-cyborg]

Thanks for opening this pull request! Please check out our contributing guidelines. (https://flink.apache.org/contributing/how-to-contribute.html)

[macdoor]

@Tyhoning

[ERROR] Could not execute SQL statement. Reason:
java.lang.UnsupportedOperationException: Doesn't support Gaussdb type 'int1' yet

[Tyhoning]

@Tyhoning

[ERROR] Could not execute SQL statement. Reason:
java.lang.UnsupportedOperationException: Doesn't support Gaussdb type 'int1' yet

Pls check you files type , used 'int4' instead of 'int1'

[Tyhoning]

Click here to join Jira discuss。
https://issues.apache.org/jira/browse/FLINK-37737

[eskabetxe]

Some minor comments left..

Is GaussDD a postgres syntax compatible? if yes please use CrateDB as reference.

@1996fanrui can you run CI/CD please

[liubao68]

Some minor comments left..

Is GaussDD a postgres syntax compatible? if yes please use CrateDB as reference.

@1996fanrui can you run CI/CD please

GaussDB was developed from PostgreSQL but now is not compatible with PostgreSQL and will not in the future.

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