KT-3267 Put binary format version into the generated class files

#KT-3267 Fixed

runtime/src/jet/runtime/typeinfo/JetClass.java

@@ -31,4 +31,6 @@ public @interface JetClass {
      * @return flags for class
      */
     int flags() default 0;
+
+    int abiVersion();
 }

runtime/src/jet/runtime/typeinfo/JetPackageClass.java

@@ -24,4 +24,5 @@ import java.lang.annotation.RetentionPolicy;
  */
 @Retention(RetentionPolicy.RUNTIME)
 public @interface JetPackageClass {
+    int abiVersion();
 }