implement String() for Driver

Author: Alex Bitkov

driver.go

@@ -3,6 +3,7 @@ package ydb
 import (
 	"context"
 	"errors"
+	"fmt"
 	"os"
 	"sync"
 
@@ -210,6 +211,16 @@ func (d *Driver) Topic() topic.Client {
 	return d.topic
 }
 
+// String returns string representation of Driver
+func (d *Driver) String() string {
+	return fmt.Sprintf(
+		"Driver{User: %s, Endpoint: %s, Database: %s, IsSecure }",
+		d.userInfo.User,
+		d.config.Endpoint(),
+		d.config.Database(),
+	)
+}
+
 // Open connects to database by DSN and return driver runtime holder
 //
 // DSN accept Driver string like