Add legacy ssd-like IRs support

[sovrasov]

Summary

In old SSD-like IRs bbox and label layers have different shapes than in current implementation. Wrapper was fixes to support both IR formats.

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added e2e tests for validation.
• I have added the description of my changes into CHANGELOG in my target branch (e.g., CHANGELOG in develop).​
• I have updated the documentation in my target branch accordingly (e.g., documentation in develop).
• I have linked related issues.

License

• I submit my code changes under the same Apache License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[goodsong81]

Thank you so much for the fix. We need to be careful for this kind of change in the future. By the way, could you update the change log? It's a new convention and I think this change is worth to note. :)

[goodsong81]

LGTM!

[jaegukhyun]

Is this for old version of openvino model inference? It would be nice if you add some summary and motivation of this work.

[sovrasov]

Is this for old version of openvino model inference? It would be nice if you add some summary and motivation of this work.

Added a brief description in summary