Fixed 504 gateway timeout on admin page

[bsekachev]

Motivation and context

• Using autocomplete to avoid fetching all resources and rendering huge lists
• Disabled some operations to avoid breaking data
• Added some more models (e.g. AnnotationGuide, Assets)

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have created a changelog fragment
• 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.