Move image classes

[zhiltsov-max]

Summary

This PR moves Image and ByteImage classes to components.media, because these classes are parts of the domain model. uitls are more about auxiliary things, which can be replaced by other providers.

• Image and ByteImage are moved from datumaro.util.image to datumaro.components.media
• Image.__init__'s loader parameter merged into data, because it was not used and their semantics was overlapping.
  It seems that loader can be more clear, though.
• Image ctor's no more accept the cache parameter, because it was not used.
• Image ctor's parameters are now mostly kw-only
• Added some type annotations and docs
• Added deprecation warnings

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) 2021 Intel Corporation
#
# SPDX-License-Identifier: MIT