Support Custom Pipelines

[sam-h-bean]

I would like to create a custom pipeline as seen here that can leverage a quantized model. I don't see the capability to extend some sort of OrtPipeline class in the same way using optimum. I have a need for a custom pipeline because of a cross encoding task which requires some custom code but I also want to leverage the awesome speedups I get from quantizing my model 😢

Let me know if this is currently possible or if this feature has already been requested