Add position ids in forward pass to opt model (#33121)
* start working on adding position ids
* add docs
* Refactor modeling_biogpt.py and modeling_opt.py for code consistency
* fix 2 PR comments
* move position_ids to end of args
* remove trailing white space
* add comment with TODO
* bug fix gradient checkpointing
* fixup
* missed on position_ids
* remove _attention_to_position_ids and refactor embedding class
* remove redundent code
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Co-authored-by: Avishai Elmakies <avishai.elma@cs.huji.ac.il>
