* add gradient_accumulation_kwargs to AcceleratorConfig * add suggestions from @muellerzr to docstrings, new behavior and tests * Documentation suggestions from @muellerz Co-authored-by: Zach Mueller <muellerzr@gmail.com> * addressed @muellerzr comments regarding tests and test utils * moved accelerate version to top of file. * @muellerzr's variable fix Co-authored-by: Zach Mueller <muellerzr@gmail.com> * address @amyeroberts. fix tests and docstrings * address @amyeroberts additional suggestions --------- Co-authored-by: Yu Chin Fabian Lim <flim@sg.ibm.com> Co-authored-by: Zach Mueller <muellerzr@gmail.com>