Define a Prompt Builder

[ksylvest]

Compatibility with features like tools and files / URLs introduces a number of complexities when not using a standardized API for prompts. This swaps to use a better API when building prompts

Usage

w/ a basic prompt

completion = client.chat('What is the capital of Japan?')

w/ a complex prompt

completion = client.chat do |prompt|
  prompt.system 'You are a helpful assistant with an expertise in animals.'
  prompt.user do |message|
    message.text 'What animals are in the attached photos?'
    message.url('https://.../cat.jpeg', "image/jpeg")
    message.url('https://.../dog.jpeg', "image/jpeg")
    message.file('./hamster.jpeg', "image/jpeg")
  end
end