atkgen: Establish pipeline toolkit from target (represented as a detector) to trained model

[leondz]

Build atkgen toolkit

• has access to datasets of LLM conversations
• given a function that detects a behaviour, identify conversations where the llm exhibits this behaviour
• identify to formats of training data:
  • continuation-based, in target turn : atkgen turn format
  • conversation-based, with whole threads
• can train on a variety of models. target set:
  • llama
  • gpt2
  • small nemotron
  • rwkv