Add support for LLM::Schema subclasses

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Add support for LLM::Schema subclasses

Example

schema.rb

##
# schema.rb
class Schema < LLM::Schema
  property :name, String, "The person's name", required: true
  property :age, Integer, "The person's age", required: true
  property :friends, Array[String,Integer], "The name or IDs of friends", optional: true
  # ...
end

main.rb

##
# main.rb
llm = LLM.openai(key: ENV["KEY"])
bot = LLM::Bot.new(llm, schema: Schema.object)
prompt = bot.build_prompt do
  it.system "The user's name is Robert, their age is 29 and their friends are 7 and Moses"
  it.user "Tell me about myself"
end
print bot.chat(prompt).content!, "\n"