Allow passing session_options for ORT backend

[cloudhan]

ONNXRuntime accepts a session_options during session creation. It enables a lot of configuration and tuning.

To use it, for example, enable verbose level log

import onnxruntime as ort
ort.set_default_logger_severity(args.log_severity)

sess_options = ort.SessionOptions()
sess_options.log_severity_level = 0  # Verbose 

pipe = StableDiffusionOnnxPipeline.from_pretrained(
    "<the-model>",
    provider=args.provider,
    sess_options=sess_options,
)

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[cloudhan]

@anton-l @pcuenca could you take a look?

[pcuenca]

This sounds interesting, what do you think @anton-l ?

[anton-l]

Yeah, wanted to add these for easier debugging too, thanks @cloudhan!