Added Group bitswap

[RichardLitt]

I added ipfs bitswap stat, wantlist, and unwant. I also added an Error object data structure for better error logging for future requests.

[RichardLitt]

cc @dignifiedquire @diasdavid

[daviddias]

• of a peer or itself

[RichardLitt]

I don't understand the context for this comment: can you rephrase?

[daviddias]

because if the param 'peer' is passed, we will see the want list that we have from that peer, if we don't pass anything, our own want list will be shown

[RichardLitt]

Covered in the options. See updated code.

[daviddias]

Looks like we are starting to get some material we can open issues on go-ipfs :)

[daviddias]

Seems like other than the tiny tid bit here #24 (comment), this is ready to be rebased and clean merged?

[dignifiedquire]

needs rebase

[RichardLitt]

Found a bug in the docs where the ability to add multiple keys isn't mentioned. Open PR. ipfs/kubo#2409

@whyrusleeping must the key in ipfs bitswap unwant <key> always be a multihash? If so, then there is a bug in here as it throws an error for empty strings.

[RichardLitt]

Fixed that bug, #2409 is closed. Key is synonymous with multihash, so, yes, and b58 always returns an empty string when decoded like that. So. This is all good.