[FEATURE REQUEST] gc should process blob storage too

[teran]

What is your use case?
Now gc handles metadata only which causes inconsistency between metadata and blob storages so GC (or probably some new component) should handle blobs not reflected in metadata database.

Is your feature request related to a problem? Please describe.
Just two of them:

• Some garbage will stay in blob repository right after GC pass
• This garbage will consume disk space while it's actually not used in any way

Describe the solution you'd like
Add blob repository processing to GC pass

Describe alternatives you've considered
Add dedicated component for housekeeping

Additional context
n/a