Petx caching in Doms and Peer Location bucketing

[gameofpointers]

@dominant-strategies/core-dev

[wizeguyy]

This is missing the actual peer buckets. I don't see anywhere the peering library attempts to maintain buckets of peers for each location. We need that logic before this can merge.

[wizeguyy]

@gameofpointers the first commit cannot merge until we implement logic to maintain a minimum number of peers from each slice. The second commit can merge now as is, and provides an optimization to our peer requests. If you want to drop the first commit, then we can merge this PR. Otherwise we still need the peer bucket logic