Added tricky handling of a caret position in input element

[bsekachev]

Motivation and context

Resolve #1919
Antd API is not enough to implement it. Some tricks with react hooks are used.

How has this been tested?

Manual testing

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (read github docs)
• I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

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

[coveralls]

Pull Request Test Coverage Report for Build 6536

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 8 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.04%) to 64.949%

---

Files with Coverage Reduction	New Missed Lines	%
datumaro/datumaro/components/extractor.py	1	90.67%
cvat/apps/engine/media_extractors.py	7	75.52%

Totals
Change from base Build 6516:	-0.04%
Covered Lines:	11057
Relevant Lines:	16620

---

💛 - Coveralls