[Datumaro] Added tf detection api tfrecord import and export (#894)
* Added tf detection api tfrecord import and export
* Added export button in dashboard
* Add tf to requirements
* Extend test
* Add tf dependency
* Require images in tfrecord export
* Add video task case handling
* Maintain image order in CVAT export
* Fix Task image id-path conversions
* Update tfrecord tests
* Extend image utilities
* Update tfrecord format
* Fix image loading bug
* Add some logs
* Add 'copy' option to project import command
* Reduce default cache size
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zhiltsov-max