Function create_writer 

pub fn create_writer(
    backend: &WriterBackendType,
    config: &WriterConnectConfig,
    clock: WriterClock,
    factories: &WriterFactoryRegistry,
) -> Result<StreamingDataSink>

Resolves a writer backend through the factory registry and constructs the writer.

All variants resolve through the registry so built-ins and custom names share one code path.

Errors

Returns an error if the backend’s factory is not registered or construction fails.