[cvat-core] support cloud storage (#3313)
* Update server-proxy
* Add cloud storage implementation && update enums
* Add api && fix server-proxy
* Add fixes
* small update
* Move from ui_support_cloud_storage
* Remove temporary credentials && fix typos
* Remove trailing spaces
* Apply lost changes
* manifest_set -> manifests
* [cvat-core] Add status && updated getpreview for getting the desired error message from the server
* Remove excess code
* Fix missing
* Add tests
* move from cycle
* Update CHANGELOG
* Increase version
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Maria Khrustaleva
Boris Sekachev