feat: ipfs bitswap command

[mappum]

We're going to need to create the ipfs bitswap command.

Subcommands:

• ipfs bitswap wantlist [<peer>] - Displays a peer's wantlist, or our own if no peer provided
• ipfs bitswap ledger <peer> - Displays ledger info for a peer (debt ratio, amount of data exchanged, etc, could have a subcommand to reset a ledger or manually set values)
• ipfs bitswap strategy - Displays some info about the strategy in use (could have subcommands to adjust strategy settings)
  Webui Features #415 depends on this

[btc]

👍

(in the short term) We'll probably want to punt on exposing information about strategy. The interface is too unstable to take on dependents.

[daviddias]

Currently, we have:

$ ipfs bitswap --help

    ipfs bitswap - A set of commands to manipulate the bitswap agent

SUBCOMMANDS:

    ipfs bitswap stat            - show some diagnostic information on the bitswap agent
    ipfs bitswap unwant <key>... - Remove a given block from your wantlist
    ipfs bitswap wantlist        - Show blocks currently on the wantlist

    Use 'ipfs bitswap <subcmd> --help' for more information about each command.

Currently ipfs bitswap <peerId> is behind the -p flag (ipfs bitswap -p )

Still missing:

• ipfs bitswap ledger - Displays ledger info for a peer (debt ratio, amount of data exchanged, etc, could have a subcommand to reset a ledger or manually set values)
• ipfs bitswap strategy - Displays some info about the strategy in use (could have subcommands to adjust strategy settings)

[whyrusleeping]

I think we can close this, once we actually have bitswap strategies we can worry about a bitswap strategy subcommand