Add implementation of the typed call method that takes a value

Author: sink772

unittest/src/main/java/score/Context.java

@@ -84,7 +84,8 @@ public static BigInteger getBalance(Address address) throws IllegalArgumentExcep
 
     public static<T> T call(Class<T> cls, BigInteger value,
                             Address targetAddress, String method, Object... params) {
-        return null;
+        var caller = stackWalker.getCallerClass();
+        return cls.cast(sm.call(caller, value, targetAddress, method, params));
     }
 
     public static Object call(BigInteger value,

unittest/src/test/java/score/ContextTest.java

@@ -30,12 +30,11 @@
 class ContextTest extends TestBase {
     private static final ServiceManager sm = getServiceManager();
     private static final Account owner = sm.createAccount();
-    private static Score echoScore;
     private static Score helloScore;
 
     @BeforeEach
     void setUp() throws Exception {
-        echoScore = sm.deploy(owner, Echo.class);
+        Score echoScore = sm.deploy(owner, Echo.class);
         helloScore = sm.deploy(owner, HelloWorld.class, "Alice", echoScore.getAddress());
     }