feat: support tongweb shell generate (resolved #11)

memshell/src/main/java/com/tongweb/catalina/Valve.java

@@ -0,0 +1,19 @@
+package com.tongweb.catalina;
+
+import com.tongweb.catalina.connector.Request;
+import com.tongweb.catalina.connector.Response;
+
+import javax.servlet.ServletException;
+import java.io.IOException;
+
+public interface Valve {
+    Valve getNext();
+
+    void setNext(Valve var1);
+
+    void backgroundProcess();
+
+    void invoke(Request var1, Response var2) throws IOException, ServletException;
+
+    boolean isAsyncSupported();
+}