✨ feat(gaussdb): 新增 GaussDB 数据库连接支持

Refs #497

internal/db/batch_write_interface_highgo_test.go

@@ -0,0 +1,12 @@
+//go:build gonavi_highgo_driver
+
+package db
+
+import "testing"
+
+func TestBatchWriteDriverCoverageHighGo(t *testing.T) {
+	var driver BatchWriteExecer = (*HighGoDB)(nil)
+	if driver == nil {
+		t.Fatal("expected HighGoDB to implement BatchWriteExecer")
+	}
+}