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256e0106 - Improve docstrings and type hints in scheduling_deis_multistep.py (#12796)

Improve docstrings and type hints in scheduling_deis_multistep.py (#12796) * feat: Add `flow_prediction` to `prediction_type`, introduce `use_flow_sigmas`, `flow_shift`, `use_dynamic_shifting`, and `time_shift_type` parameters, and refine type hints for various arguments. * style: reformat argument wrapping in `_convert_to_beta` and `index_for_timestep` method signatures.