Enable stream importer for VOC and YOLO data format

[vinnamkim]

Summary

• Ticket no. 114758
• Enable stream importer for VOC and YOLO data format
• Did some refactoring where needed

How to test

I revised the existing tests to pytest and parametrize them for the stream importer.

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

License

• I submit my code changes under the same MIT 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: MIT

[wonjuleee]

LGTM!