Added the ability to get bounding boxes in output yolo when adding prepostprocessing

[VictoriaKlyueva]

Previously, it was not possible to use the built-in function to add prepostprocessing and get a bounding boxes

[VictoriaKlyueva]

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[sayanshaw24]

/azp run onnxruntime-extensions.CI

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[azure-pipelines]

Commenter does not have sufficient privileges for PR 790 in repo microsoft/onnxruntime-extensions

[wenbingl]

/azp run onnxruntime-extensions.CI

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Azure Pipelines successfully started running 1 pipeline(s).