Support for Market-1501 dataset format

[yasakova-anastasia]

Summary

• Add support for Market-1501 dataset format

How to test

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues)

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) 2020 Intel Corporation
#
# SPDX-License-Identifier: MIT

[yasakova-anastasia]

@zhiltsov-max , do you think it is necessary to add information (camera sequence number, bounding box number and frame number) to the attributes? Now done as in Accuracy Checker.

[zhiltsov-max]

I'd better used query in attributes or attributes.get