Allow static input shapes when exporting to ONNX and OpenVINO

[adrianboguszewski]

📝 Description

• Static input shape export fixed DSR model and makes the model supported by NPU when running OV inference

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[ashwinvaidya17]

Thanks for the changes. Even though it touches the API I don't expect any backwards compatibility issues.

[samet-akcay]

This will cause some conflicts with #1803, right?

[adrianboguszewski]

This will cause some conflicts with #1803, right?

Some, but it shouldn't be a big deal, as the changes are rather small and clear IMO ;)