prioritize candidates in bitswap requests

[willscott]

we get a set of candidates from the indexer.
when bitswap is started my understanding is that it doesn't use these, but rather will only use them once it's finished dialing it's current swarm.

that seems inefficient

[hannahhoward]

this requires a change in go-bitswap. We set the "find providers" action to run immediately, but go-bitswap always starts with a broadcast. I'd really like to push back on "how we should be doing bitswap" until we really have the bandwidth to take on replacing go-bitswap.

[hannahhoward]

but that should be it's own issue, I agree.