pipe storage du: Support --depth when --cloud disabled

[ekazachkova]

Background At the moment, Cloud Pipeline allows to fetch data for pipe storage du with --depth option from cloud provider only and it would be nice to support --depth with disabled --cloud flag.

Approach

• extract folder names directly from cloud provider given specified depth
• for each folder path load stat data from API

Notes:

• for --output-mode=brief let's flush data as soon as it is received (not supported for --output-mode=all since all item's storage classes shall loaded to construct table header properly)