[ao][fx] fixing public v private prepare.py (#88398)
Summary: made _DO_NOT_OBS_DTYPE_LIST, _add_matched_node_name_to_set,
_get_arg_target_is_dynamic_as_input_to_node, _get_arg_target_is_dynamic_as_input_to_node,
_get_arg_target_dtype_as_input_to_node,
_get_arg_target_dtype_as_output,
_get_target_activation_dtype_for_node,
_get_standalone_module_configs,
_insert_observer,
_is_activation_post_process_node,
_is_input_arg_dtype_supported_by_backend,
_is_observer_in_same_graph,
_is_output_dtype_supported_by_backend,
_maybe_insert_input_equalization_observers_for_node,
_maybe_insert_input_observer_for_arg_or_kwarg,
_maybe_insert_input_observers_for_node,
_maybe_insert_observers_before_graph_output,
_maybe_insert_output_observer_for_node,
_maybe_make_input_output_share_observers,
_maybe_propagate_dtype_for_node,
_qat_swap_modules,
_remove_output_observer,
_run_prepare_fx_on_standalone_modules,
_save_state,
_swap_custom_module_to_observed private
Test Plan: python test/test_public_bindings.py
Reviewers:
Subscribers:
Tasks:
Tags:
Differential Revision: [D41015542](https://our.internmc.facebook.com/intern/diff/D41015542)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88398
Approved by: https://github.com/jcaip
