[FLINK-39252][pipeline-connector/sqlserver] Add SQL Server pipeline connector

[Daishuyuan]

What is changed

• add a new SQL Server pipeline connector module with source provider, event deserializer, metadata accessor, schema/type utilities and factory wiring
• integrate the new module into the pipeline connectors build and register the connector factory service
• add coverage for full types, metadata access, online schema migration, parallel snapshot, newly added tables and table pattern matching
• add the source-connector side updates needed by the pipeline connector integration

Why

Flink CDC currently has a source SQL Server connector but does not provide the corresponding pipeline connector. This change adds SQL Server pipeline connector support so SQL Server can be used in pipeline jobs consistently with other databases.

[Daishuyuan]

Hi @lvyanquan, @loserwang1024, could you help review this PR when you have time?

I have addressed the previous comment and updated the SQL Server pipeline connector implementation and tests accordingly. Thanks.

[Daishuyuan]

Hi @yuxiqian, @leonardBang, this PR adds the SQL Server pipeline connector and also includes several source-side SQL Server changes. Could you help take a look when you have time? Thanks.

[leonardBang]

Hi @yuxiqian, @leonardBang, this PR adds the SQL Server pipeline connector and also includes several source-side SQL Server changes. Could you help take a look when you have time? Thanks.

@Daishuyuan Thanks for the contribution! But we're going to code freeze soon and have no enough committers to help review this PR, considering this feature was not included in 3.6 roadmap, maybe we'd like to delivery this feature in next version.