go-bitswap is used by many other pieces of software, it's also big and we don't touch it often.

I don't think it's worth moving into libkubo

The criteria for moving repos into libipfs isn't "unused, small, and unchanging"...the goal is to get all of our repos into one place, big and small, popular and unpopular. (Of course there will be exceptions to this, but they should be exceptions, and we should have a good practical reason for not moving them.) Also consider that part of the reason we don't touch it often is because the plumbing is painful.

The tactical reason I am opening this now is because it is big and used by many other components, so it's a good stress test of the process for migrating repos into libipfs.