Deduplication within one agreement

[vojtechsimetka]

Problem

Since IPFS hash can point to a folder which has an overlapping files, the actual size on disk can be less than the sum of all the distinct files. E.g.

folder1/file1
folder1/file2
folder2/file1
folder2/file3

Task

• Implement Add some way to get the actual storage size of an object ipfs/kubo#5910

Linked issues

• Verify the actual stored size on disk #124