BJ-988: Add PreparationFlowServiceServlet just in case

src/main/java/com/rbkmoney/threeds/server/storage/servlet/PreparationFlowServiceServlet.java

@@ -0,0 +1,33 @@
+package com.rbkmoney.threeds.server.storage.servlet;
+
+import com.rbkmoney.damsel.three_ds_server_storage.PreparationFlowServiceSrv;
+import com.rbkmoney.threeds.server.storage.handler.PreparationFlowServiceHandler;
+import com.rbkmoney.woody.thrift.impl.http.THServiceBuilder;
+import lombok.RequiredArgsConstructor;
+
+import javax.servlet.*;
+import javax.servlet.annotation.WebServlet;
+import java.io.IOException;
+
+@RequiredArgsConstructor
+@WebServlet("/three-ds-server-storage/preparation-flow")
+public class PreparationFlowServiceServlet extends GenericServlet {
+
+    private final PreparationFlowServiceHandler handler;
+
+    private Servlet servlet;
+
+    @Override
+    public void init(ServletConfig config) throws ServletException {
+        super.init(config);
+        servlet = new THServiceBuilder()
+                .build(PreparationFlowServiceSrv.Iface.class, handler);
+    }
+
+    @Override
+    public void service(
+            ServletRequest request,
+            ServletResponse response) throws ServletException, IOException {
+        servlet.service(request, response);
+    }
+}