Write callable member's kind to JetMethod annotation

Reuse deprecated kind() parameter in JetMethod annotation to store
CallableMemberDescriptor.Kind if it's not DECLARATION.

JavaDescriptorResolver doesn't always resolve members to DECLARATION
anymore, instead it deserializes member's kind from the annotation.

Create DescriptorKindUtils to convert Kind to int value and back.

runtime/src/jet/runtime/typeinfo/JetMethod.java

@@ -34,9 +34,9 @@ import java.lang.annotation.Target;
 @Retention(RetentionPolicy.RUNTIME)
 public @interface JetMethod {
     /**
-     * @deprecated use flags instead
+     * See CallableMemberDescriptor.Kind
+     * @return kind of this method
      */
-    @Deprecated
     int kind() default 0;
 
     /**