Keyboard shortcut to delete frame (fixes #5369)

[scottykwok]

Motivation and context

This fixes #5369 by adding keyboard shortcut [x] that delete a frame without prompt.

How has this been tested?

Rebuild cvat/ui docker image locally and tested locally.

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.

[nmanovic]

@scottykwok , thanks for the contribution! Let's see if all tests are passed. Could you please add a function test for the feature? Thus we will be sure that it works after our modifications.

@klakhov , could you please review the PR?

[bsekachev]

I am not sure deleting frame by X is a good idea. Too many functional keys near the X. It might be often pressed accidentaly.
Also, I believe, deleting a frame should work with the same key Del as deleting in object (maybe with a modificator, etc. Need to think more about it.)

[klakhov]

I'd agree with @bsekachev. It would be much better with Alt+Del.

[GeorgePearse]

I'd really like this feature, happy with Alt+Del or X

[scottykwok]

Agreed. Alt+Del is a good suggestion.
Then I will try update the pull request accordingly.

[nmanovic]

@scottykwok , please let us know if you want to improve the PR?

[bsekachev]

/check

[github-actions]

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[bsekachev]

LGTM, Thank you for the contribution!