feature(dsp) Remove default max token param from OpenAI

[Vasilije1990]

For sending data to models with large context, this causes an artificial limit of outbound text and limits to max 8000 tokens. You are unable to set a large max_token value due to inherent limitations, and with a small value, it is hard to get more complex prompts to work for knowledge graph generation.

OpenAI sets it to infinite, which is optimal.

[arnavsinghvi11]

Hi @Vasilije1990 , thanks for the PR. unfortunately, this can't be merged since it will break existing caches. Why can you not set the max_tokens within your LM configuration?