allow for do_sample=True

[chris-aeviator]

we might not always want greedy sampling do we?
Could you implement do_sample beeing an init param for JsonFormer or is there anything technically that prohibits this change?

[lettucegoblin]

I was able to set my model to do_sample=True before passing it to jsonformer.
model = AutoModelForCausalLM.from_pretrained( "databricks/dolly-v2-3b", device_map='auto', use_cache=True, do_sample=True)