The instructlab userbase will have hardware that require various training configuration options

e.g. to train on colab I needed to disable bf16 and set
gradient_checkpointing=true
gradient_accumulation_steps=8

we should add a hidden, (perhaps temporary) argument to allow users to try various training options without
having to change the code

this could eventual be replaced with a happy set of arguments we know would cover all the cases
or code to auto sense the HW and set options based on what it finds.