Adding model prices

[Unskilledcrab]

We need to figure out a way to determine each widgets price consumption and be able to estimate how much it costs to run each widget

Probably the models should be a custom enum we maintain because it might not always be openai models.

• Id
• model name
• description
• model type (text, pic)
• model price type (per 1k token, per image)
• Input price (price of the prompt) could be 0 for images
• output price (price of response)