Inplace save in formats - COCO, CVAT, Datumaro, TF Detection API

[zhiltsov-max]

Depends on #102

Summary

• Added inplace save in CVAT, COCO, TF detection API formats
• Added dataset binding to a format and location
• Added auto-binding of Dataset instances to the first export location

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