Add alternative approach in ONNX converter section #6188
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Description
This adds a short section explaining an alternative approach to dedicated converter libraries for library authors looking to implement ONNX export capability for their library. This approach leverages a standardised protocol (in this case the Array API standard) and an ONNX based implementation of it (in this case ndonnx).
Motivation and Context
This adds some broader context to the different ways libraries may want to explore ONNX export beyond the traditional approach with dedicated converter libraries.