input: def generate_store_item_class() -> str:
      """
      Generate a Python class for an online store item that includes fields for ID, name, 
      price, and description. The class should also include a `__str__` method that returns 
      the item's name and price, and a `to_dict` method that returns a dictionary representation 
      of the item's attributes.
      >>> generate_store_item_class()
      """
      class StoreItem:
          def __init__(self, item_id, name, price, description):
              self.item_id = item_id
              self.name = name
              self.price = price
              self.description = description
  
          def __str__(self):
              return f'{self.name}, ${self.price}'
  
          def to_dict(self):
              return {
                  'item_id': self.item_id,
                  'name': self.name,
                  'price': self.price,
                  'description': self.description
              }
      return str(StoreItem)
output:     class StoreItem:
          def __init__(self, item_id, name, price, description):
              self.item_id = item_id
              self.name = name
              self.price = price
              self.description = description
  
          def __str__(self):
              return f'{self.name}, ${self.price}'
  
          def to_dict(self):
              return {
                  'item_id': self.item_id,
                  'name': self.name,
                  'price': self.price,
                  'description': self.description
              }
      return str(StoreItem)