Fix for KT-5410 J2K: someObject + "someString" should be converted to someObject.toString() + "someString"

Otherwise `+` operator will not resolve

j2k/testData/fileOrElement/binaryExpression/lhsObjectPlusString.java

@@ -0,0 +1,22 @@
+public class Test {
+    public static class B {
+        public static class C {
+
+        }
+
+        public C c() {
+            return new C();
+        }
+    }
+
+    public void a() {
+        B b = new B();
+        System.out.println(b + "");
+        String a = 1 + "0";
+        System.out.println(b.c() + "");
+    }
+
+    public static void main(String[] args) {
+        String p = new Test() + "123";
+    }
+}

j2k/testData/fileOrElement/binaryExpression/lhsObjectPlusString.kt

@@ -0,0 +1,23 @@
+class Test {
+    class B {
+        class C
+
+        fun c(): C {
+            return C()
+        }
+    }
+
+    fun a() {
+        val b = B()
+        println(b.toString() + "")
+        val a = 1.toString() + "0"
+        println(b.c().toString() + "")
+    }
+
+    companion object {
+
+        @JvmStatic fun main(args: Array<String>) {
+            val p = Test().toString() + "123"
+        }
+    }
+}

j2k/tests/org/jetbrains/kotlin/j2k/JavaToKotlinConverterForWebDemoTestGenerated.java

@@ -553,6 +553,12 @@ public class JavaToKotlinConverterForWebDemoTestGenerated extends AbstractJavaTo
             doTest(fileName);
         }
 
+        @TestMetadata("lhsObjectPlusString.java")
+        public void testLhsObjectPlusString() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/binaryExpression/lhsObjectPlusString.java");
+            doTest(fileName);
+        }
+
         @TestMetadata("minus.java")
         public void testMinus() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/binaryExpression/minus.java");

j2k/tests/org/jetbrains/kotlin/j2k/JavaToKotlinConverterSingleFileTestGenerated.java

@@ -553,6 +553,12 @@ public class JavaToKotlinConverterSingleFileTestGenerated extends AbstractJavaTo
             doTest(fileName);
         }
 
+        @TestMetadata("lhsObjectPlusString.java")
+        public void testLhsObjectPlusString() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/binaryExpression/lhsObjectPlusString.java");
+            doTest(fileName);
+        }
+
         @TestMetadata("minus.java")
         public void testMinus() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/binaryExpression/minus.java");