Changes to Update PDF currency

the response property pdf/notes became nullable for the status 200

added the optional property pdf/has_unexplained_edits to the response with the 200 status

added the optional property pdf/reconciliation_method to the response with the 200 status

added the optional property pdf/reconciliation_status to the response with the 200 status

added the optional property pdf/statements/items/reconciliation_method to the response with the 200 status

added the optional property pdf/statements/items/reconciliation_status to the response with the 200 status

the response optional property pdf/notes became read-only for the status 200