Extend typing to path-like objects in `PretrainedConfig` and `PreTrainedModel` (#8770)
* update configuration_utils.py typing to allow pathlike objects when sensible
* update modeling_utils.py typing to allow pathlike objects when sensible
* black
* update tokenization_utils_base.py typing to allow pathlike objects when sensible
* update tokenization_utils_fast.py typing to allow pathlike objects when sensible
* update configuration_auto.py typing to allow pathlike objects when sensible
* update configuration_auto.py docstring to allow pathlike objects when sensible
* update tokenization_auto.py docstring to allow pathlike objects when sensible
* black