Improved chunk generation from cloud storages

[azhavoro]

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 the CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (see 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.

[codecov]

Codecov Report

Merging #6881 (cd1eab5) into develop (26693dd) will increase coverage by 0.02%.
Report is 3 commits behind head on develop.
The diff coverage is 93.18%.

@@             Coverage Diff             @@
##           develop    #6881      +/-   ##
===========================================
+ Coverage    82.50%   82.52%   +0.02%     
===========================================
  Files          370      370              
  Lines        39861    39868       +7     
  Branches      3559     3559              
===========================================
+ Hits         32886    32901      +15     
+ Misses        6975     6967       -8     

Components	Coverage Δ
cvat-ui	77.56% <ø> (ø)
cvat-server	86.88% <93.18%> (+0.04%)	⬆️