feat: add human flag to repo stat cli command

[PedroMiguelSS]

This PR adds --human flag to repo stat command.

Usage:

> jsipfs repo stat --human

Output:

NumObjects: 16
RepoSize: 30.1 KB
StorageMax: 9.01 PB
RepoPath: /var/folders/l1/(...)
Version: 7

This PR supersedes #2592.
Reason: ipfs/js-ipfs-repo#213 (comment).

⚠️This PR needs the following PR merged and released before this one can be:

• feat: remove options object from stat method js-ipfs-repo#216

[alanshaw]

Changes LGTM.

⚠️This PR needs the following PR merged and released before this one can be:

• feat: remove options object from stat method js-ipfs-repo#216

It doesn't actually depend on it though...right? I think we should get this merged and we can get the repo update later.

[PedroMiguelSS]

Yap, it does not depend directly on it. I was just making sure we got js-ipfs-repo updated when this one was merged. But we can do as you say: merge it and update the dependency later.