Expose helpers for checking if messages and enums are nested.

This would be necessary for wrapping our java gencode (e.g. j2cl or kotlin dsl), mimicking it (e.g. alternative java implementations), or colocating new classes.

PiperOrigin-RevId: 816914168

Author: mkruskal-google

java/core/src/main/java/com/google/protobuf/GeneratorNames.java

@@ -338,12 +338,12 @@ private static boolean getNestInFileClass(FileDescriptor file, JavaFeatures reso
     }
   }
 
-  private static boolean getNestInFileClass(Descriptor descriptor) {
+  public static boolean getNestInFileClass(Descriptor descriptor) {
     return getNestInFileClass(
         descriptor.getFile(), descriptor.getFeatures().getExtension(JavaFeaturesProto.java_));
   }
 
-  private static boolean getNestInFileClass(EnumDescriptor descriptor) {
+  public static boolean getNestInFileClass(EnumDescriptor descriptor) {
     return getNestInFileClass(
         descriptor.getFile(), descriptor.getFeatures().getExtension(JavaFeaturesProto.java_));
   }