[TD-2132]<test>: add memory leak test case

src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AppMemoryLeakTest.java

+package com.taosdata.jdbc.cases;
+
+import org.junit.Test;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class AppMemoryLeakTest {
+
+    @Test
+    public void testAppMemoryLeak() {
+        try {
+            Class.forName("com.taosdata.jdbc.TSDBDriver");
+
+            while (true) {
+                DriverManager.getConnection("jdbc:TAOS://localhost:6030/?user=root&password=taosdata");
+            }
+        } catch (ClassNotFoundException | SQLException e) {
+            e.printStackTrace();
+        }
+    }
+}