Supported type for all labels

[bsekachev]

Motivation and context

How has this been tested?

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.

[bsekachev]

/check

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[klakhov]

Patch works for me.
What do you think about adding appropriate enum for label types? It doesn't feel right to use consts like 'tag' or 'any'.

[bsekachev]

Patch works for me. What do you think about adding appropriate enum for label types? It doesn't feel right to use consts like 'tag' or 'any'.

I think it makes sense..
Not it is described like type = 'rectangle' | 'polygon' | ...