Add OpenCV MIL tracker tool

[klakhov]

Motivation and context

This pr is next step of integration OpenCV into CVAT. Browser tracking provided by OpenCV.js can be useful on simple objects because its quite fast.

TODO:

• Add OpenCV.js with tracking module
• Add tracking tool
• Implement tracking on change frame
• Support user adjustments
• Test with lots of tracking objects
• Test with server-side tracking

How has this been tested?

Manual testing at this moment.
If you want to try this PR, you need update opencv version properly: python manage.py collectstatic --clear

Checklist

• I submit my changes into the develop branch
• I have added a 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) 2022 Intel Corporation
#
# SPDX-License-Identifier: MIT

[alalek]

Great!

[bsekachev]

Hmm, my web page gets frozen after OpenCV library is fully downloaded

This behaviour is stable in different tasks

[bsekachev]

Hi,

• Collectstatic does not clear old opencv version, so, the server gives it to UI and UI is frozen
• N button does not work to create one more object
• "No trackers available" (send you scenario)
• Tracker does not work in the following scenario:
  

[klakhov]

@bsekachev I've fixed scenarios you mentioned above.

It seems that to migrate to new opencv version properly we need to do python manage.py collectstatic --clear

[bsekachev]

When bbox rotated a bit and it is getting out of frame, I get error when tracking:

[nmanovic]

LGTM

[klakhov]

@TOsmanov Could you please update the user guide about new tracking tool?

[TOsmanov]

@TOsmanov Could you please update the user guide about new tracking tool?

@klakhov Yes, sure