Add slerp import for extension backwards compat

import modules.sd_hijack

from modules import devices, prompt_parser, masking, sd_samplers, lowvram, generation_parameters_copypaste, extra_networks, sd_vae_approx, scripts, sd_samplers_common, sd_unet, errors, rng

from modules.rng import slerp # noqa: F401

from modules.sd_hijack import model_hijack

from modules.sd_samplers_common import images_tensor_to_samples, decode_first_stage, approximation_indexes

from modules.shared import opts, cmd_opts, state