Change driver name from godatabrickssqlconnector to databricks-sql-go

Aligns driver name with telemetry system and improves consistency:
- User-Agent header now uses: databricks-sql-go/1.9.0
- Telemetry already uses: databricks-sql-go
- Shorter, cleaner, follows common naming patterns

This provides consistent driver identification across all systems.

Signed-off-by: Samikshya Chand <samikshya.chand@databricks.com>
Signed-off-by: samikshya-chand_data <samikshya.chand@databricks.com>

Author: samikshya-db

internal/config/config.go

@@ -200,7 +200,7 @@ func WithDefaults() *Config {
 		ClientTimeout:             900 * time.Second,
 		PingTimeout:               60 * time.Second,
 		CanUseMultipleCatalogs:    true,
-		DriverName:                "godatabrickssqlconnector", // important. Do not change
+		DriverName:                "databricks-sql-go",
 		ThriftProtocol:            "binary",
 		ThriftTransport:           "http",
 		ThriftProtocolVersion:     cli_service.TProtocolVersion_SPARK_CLI_SERVICE_PROTOCOL_V8,