Add ID formatting functions, used by various IPFS cli commands

[petar]

For now, support "b36cid", "b58mh" ID formats.

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[aschmahmann]

I'd take a look at the key tests as well I suspect they also have plenty of id.Pretty() being called.

[aschmahmann]

Looks pretty good to me. It would be great if you could rebase the commits so we have:

• Dependency (+CI) updates
• Actual updates

[petar]

Looks pretty good to me. It would be great if you could rebase the commits so we have:

• Dependency (+CI) updates
• Actual updates

I did that. One small issue: One of the go.mod commits also contained some code adding a fmt function.
This code is still glued into the first squashed commit above.

[aschmahmann]

Just one small change but otherwise looks good (pending the other two PRs being ready to go)