[I] [feat][io] Add Debezium Db2 source connector [pulsar-connectors]

["david-streamlio (via GitHub)" <gi...@apache.org>]

david-streamlio opened a new issue, #66:
URL: https://github.com/apache/pulsar-connectors/issues/66

   ## Motivation
   
   Debezium ships a Db2 source connector (`io.debezium:debezium-connector-db2`, present in the `debezium-bom` at our pinned version), but this repository does not wrap it. We currently wrap 5 of Debezium's 12 source connectors: MySQL, PostgreSQL, MongoDB, Oracle, and SQL Server.
   
   Db2 is a mature Debezium connector with real enterprise demand, and its CDC model (capture tables, populated by an ASN capture agent) is close enough to SQL Server's that the existing `debezium/mssql` module is a reasonable structural template.
   
   ## Proposal
   
   Add a `debezium/db2` module (`pulsar-io-debezium-db2`) following the structure of the existing Debezium modules:
   
   - `DebeziumDb2Source` extending `DebeziumSource`
   - `include("debezium:pulsar-io-debezium-db2")` in `settings.gradle.kts`
   - `debezium-connector-db2 = { module = "io.debezium:debezium-connector-db2" }` in the version catalog
   - NAR packaging + distribution wiring
   - A Testcontainers integration test using the `icr.io/db2_community/db2` image
   
   ## Notes
   
   - **Check whether Db2 is a multi-partition connector.** If it is, it will hit the same `task.id` gap as SQL Server (#61), where `AbstractKafkaConnectSource` never calls `connector.taskConfigs()` for Debezium sources. #61 should ideally land first.
   - Verify the Db2 JDBC driver (`com.ibm.db2:jcc`) reaches the NAR at runtime; `debezium-connector-db2` may not bundle it. (For comparison, `debezium-connector-oracle` *does* pull `ojdbc11` transitively — verified in #62.)
   - The Db2 container image is large and requires accepting a license and privileged mode; evaluate CI runtime cost before committing to running its test on every PR.
   - Use the `GenericContainer` pattern (see the Testcontainers version conflict noted in #62).
   
   _Identified by a scan of the Debezium connector catalog against our connector inventory._


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