Fix addMetadataFields() to carry over 'props'

[shangxinli]

Inside addMetadataFields(), it trunks the 'props' after adding the metadata. This blocks scenario where it relies those 'props' to let Parquet do some work like encryption. The fix is simple by adding the 'props'.

 for (Schema.Field field : schema.getFields()) {
   if (!isMetadataField(field.name())) {

•    Schema.Field newField = new Schema.Field(field.name(), field.schema(), field.doc(), null);
  

•    for (Map.Entry<String, JsonNode> prop : field.getJsonProps().entrySet()) {
  

•      newField.addProp(prop.getKey(), prop.getValue());
  

•    }
  

•    parentFields.add(newField);
   }
  

  }

This passed the unit test and verified working in that the 'props' can pass to Parquet.