[WAYANG-55] Implement JDBC Driver for Apache Wayang

[harshitsingh070]

[WAYANG-55] Implement JDBC Driver for Apache Wayang

Fixes: https://issues.apache.org/jira/browse/WAYANG-55

This PR introduces a JDBC driver module that enables SQL clients and
external tools to connect to Apache Wayang using the standard JDBC interface.

Key features:

• JDBC driver entry point (jdbc:wayang:)
• WayangConnection, WayangStatement, WayangPreparedStatement
• ResultSet backed by Wayang Record objects
• DatabaseMetaData and ResultSetMetaData support
• Metadata discovery (getTables, getColumns, getSchemas)
• SPI driver registration (META-INF/services/java.sql.Driver)
• Integration tests (19 tests passing)

The driver delegates SQL execution to Wayang's SQL API.

[harshitsingh070]

Hi @zkaoudi — following up on this PR after a few updates.

Since the initial submission, I’ve made a few improvements:

• Fixed SqlContext.executeSql() to use Optimizer.convertWithConfig() so the Wayang configuration is properly propagated
• Implemented getTables(), getColumns(), and getSchemas() in DatabaseMetaData
• All 19 unit and integration tests are passing (including end-to-end SQL execution)

The current design directly implements java.sql interfaces and delegates execution to api-sql.

I’d appreciate feedback on:

• whether this approach aligns with Wayang’s architecture or if using Calcite Avatica would be preferred
• expectations around DatabaseMetaData completeness

Happy to split this into smaller PRs if that makes review easier.

[harshitsingh070]

Added documentation for this driver in #722.