Add support for IBM Power System i

#### General

We're encountering issues using Reactive Hibernate with Vert.x reactive db2 client and DB2 hosted on IBM Power i (AS400) v7.4. It appears that the Vert.x Reactive DB2 Client explicitly supports only DB2 on Linux, Unix, and Windows and and possibly DB2 for z/OS as mentioned [here](https://vertx.io/docs/vertx-db2-client/java/).

#### Problem Description:

When attempting to connect, the server's release version string on IBM Power i begins with "V" (e.g., V07R04M00). The Vert.x reactive db2 client expects the release version to start with either SQL (for Linux/Unix/Windows) or DSN (for DB2 z/OS). This mismatch triggers the following exception:
`java.lang.IllegalArgumentException: Received unknown server product release level: V07R04M00`

As a result, the DB connection initialization immediately fails.

#### Environment:

Reactive Hibernate

Vert.x

IBM Power i v7.4

#### Feature
Is the lack of support for DB2 on IBM Power i due to known compatibility issues or simply because it is a proprietary system and hasn't been tested/supported yet?

Clarification on this point would help us understand if there are inherent limitations or if future support could be expected.