[python] add parameter object_hook to method dump_model #4533
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Method dump_model parses a string to create a JSON structure. If a function needs to modify this structure, it needs to walk through the whole structure a second time. The object_hook can be used to do both in one pass. This trick was used to significantly speed up the conversion of an heavy model (>40.000 trees) into ONNX (onnx/onnxmltools#491). This PR would avoid duplication of the code of dump_model in onnxmltools.