The underlying SDK functions already emit human-friendly log messages
with the ID of the created resource. Instead of printing largely the
same message twice, we can just print the ID. That way, the CLI can be
more easily integrated into other software.
Currently, the CLI has one level of subcommands, and all subcommands
work on tasks. This leaves no room for subcommands that work on other
CVAT resources.
This change redesigns the CLI interface by adding another level of
subcommand hierarchy. Instead of running `cvat-cli <action>`, the user
will now run `cvat-cli <resource> <action>`. Previously available
commands are left available as deprecated aliases.
As a proof of concept, this PR adds some basic project actions.
I have also used this opportunity to correct some of the task action
names, specifically `export`, `import`, `dump` and `upload`. These names
don't correspond to either SDK function names, API endpoints, or UI
labels corresponding to these actions. In the new subcommand hierarchy,
I renamed those commands to `backup`, `create-from-backup`,
`export-dataset` and `import-dataset`, which are more consistent with
how other CVAT components call these actions.
I rewrote the introduction and usage sections of the cli README and
reference in order to reduce clutter and remove the need to
resynchronize the help output after every interface change.
Andrei Strongin