This PR gets rid of Tqdm progress bars inside `dvc.objects`.
Those are replaced with multi-phase callback in `hashes_exist`, and
simple callable that takes `completed` value in
`odb._estimate_remote_size()`.
The `odb.list_hashes_exists()` and `odb.all()` now return iterables,
hence the caller has the responsibility of handling progress.
This is now handled in `dvc.data` by using a custom `Tqdm` progressbar.
This is ugly and is temporary, but my motivation is to remove tqdm from dvc.objects
first. We can gradually get rid of these from `dvc.data` too, but
that requires more knowledge about `dvc.data` and involves more
design work. All in time, I guess. :)
Saugat Pachhai (सौगात)
112ea1d448