NeoFS block storage audit

[AnnaShaleva]

Is your feature request related to a problem? Please describe.

Sometimes we may have duplicating index file (#3762) or duplicating blocks (#3654 (comment)) uploaded by util upload-bin CLI command. We can't reliably avoid duplicates because of the way how NeoFS works (#3763 (comment)), so we need to live with it.

Describe the solution you'd like

Build a separate CLI command (that will later become a fully-qualified service) that should perform audit of NeoFS block storage. This command should take care of uploaded blocks, index files, snapshots etc.:

1. Validate uploaded objects consistency.
2. Check for duplicates, compare&verify them, remove useless duplicates.
3. Raise alerts in case if block storage is corrupted in any way.

Describe alternatives you've considered

No.