v1.15.0: OpenVINO Tokenizers, quantization configuration

• Add OpenVINO Tokenizers by @apaniukov #513

• Introduce the OpenVINO quantization configuration by @AlexKoff88 #538

• Enable model OpenVINO export by @echarlaix in #557

from diffusers import StableDiffusionPipeline
from optimum.exporters.openvino import export_from_model

model_id = "runwayml/stable-diffusion-v1-5"
model = StableDiffusionPipeline.from_pretrained(model_id)

export_from_model(model, output="ov_model", task="stable-diffusion")