[Feature][jdbc] dameng + DB2 support upsert SQL

[melin]

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

Description

DB2 + Dameng does not currently support upsert
https://github.com/apache/incubator-seatunnel/blob/dev/seatunnel-connectors-v2/connector-jdbc/src/main/java/org/apache/seatunnel/connectors/seatunnel/jdbc/internal/dialect/dm/DmdbDialect.java

https://github.com/apache/incubator-seatunnel/blob/dev/seatunnel-connectors-v2/connector-jdbc/src/main/java/org/apache/seatunnel/connectors/seatunnel/jdbc/internal/dialect/db2/DB2Dialect.java

dameng merge into sql:
https://eco.dameng.com/document/dm/zh-cn/sql-dev/practice-dml-operation.html#MERGE%20INTO%20%E6%93%8D%E4%BD%9C

db2 merge into sql:
https://www.ibm.com/docs/en/db2-for-zos/12?topic=statements-merge

Usage Scenario

No response

Related issues

No response

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

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