Source & target storage support

[Marishka17]

Motivation and context

UI

• Added ability to specify source & target storage on project and task creating pages, import & export modals.
• Modified annotations import
• Modified backups import and export

Server

• small enhancement: moved file downloading process to job

How has this been tested?

Manually
Small demo showing how it works.

Documentation and tests for this functionality will be in other PRs

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.

[Marishka17]

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[Marishka17]

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[BonVant]

Hi @Marishka17 ! Thanks for the contribution. I was wondering whether all the data is still downloaded from source to container before being exported to target storage ?
S3 source manifest + files -> Local container volume such as /home/django/data -> S3 target manifest + job _annotations.zip

Would be interesting albeit maybe complex to avoid storing locally large chunks of data and directly interact with the S3 target bucket ?