Vertica database support

Is your feature request related to a problem? Please describe?

The migration tool currently does not support Vertica as a source or target database. This prevents users with Vertica-based environments from using the tool to migrate their data and requires them to rely on alternative tools or manual migration processes.

Describe the solution you'd like

Add Vertica support to the migration tool, allowing users to connect to Vertica databases and perform migrations using the same workflow and capabilities currently available for supported database types.

Describe alternatives you've considered

Users can perform the migration manually or use external Vertica-specific migration tools. However, these approaches require additional tooling and do not provide the consistency and integration of using the existing migration tool.

Additional context

The implementation should follow the existing database integration patterns and provide the necessary Vertica connection, schema discovery, data migration, and error handling capabilities.