input: Write a python function to retrieve and return the allowed values of the attribute 'parent_type' from the BTConfiguredValuesColumnInfo1025 class.
  assert get_parent_type_allowed_values() == {'FEATURE': 'FEATURE', 'INSTANCE': 'INSTANCE', 'MATE': 'MATE', 'MATE_CONNECTOR': 'MATE_CONNECTOR', 'UNKNOWN': 'UNKNOWN'}
output: def get_parent_type_allowed_values():
      class BTConfiguredValuesColumnInfo1025:
          @staticmethod
          def getAllowedValues(attribute):
              if attribute == 'parent_type':
                  return {
                      'FEATURE': 'FEATURE',
                      'INSTANCE': 'INSTANCE',
                      'MATE': 'MATE',
                      'MATE_CONNECTOR': 'MATE_CONNECTOR',
                      'UNKNOWN': 'UNKNOWN'
                  }
              return {}
  
      return BTConfiguredValuesColumnInfo1025.getAllowedValues('parent_type')