SDK alpha 1 release

[zhiltsov-max]

Motivation and context

Related #1517
Closes #3716
Closes #4637
Closes #4859

• SDK:
  • Updated package docs
  • Added missing pillow dependency
  • Removed generated version file
• CLI:
  • Aligned version number with SDK
  • Updated README: added examples, installation uses package

Examples:

• sdk https://test.pypi.org/project/cvat-sdk/2.0a1.dev1/
• cli https://test.pypi.org/project/cvat-cli/2.0a1/

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.

[nmanovic]

@zhiltsov-max , it is a known way to version python packages? It looks unusual.

[zhiltsov-max]

Yes, it is described here: https://peps.python.org/pep-0440/#public-version-identifiers and https://peps.python.org/pep-0440/#pre-releases