`GetPeers` suggestions

[ross-weir]

Couple of suggestions for GetPeersSpec messages to help with light node client efficiency, maybe premature optimizations but wanted to make note:

1. Include a count parameter so the requester can limit how many peers are received, for example a light client might only want to request 10 peers to reduce network usage. If a node sends back more peers than requested and is running on a recent version maybe consider it a malicious peer or just process them.
2. Include a filter (bloom filter maybe) parameter to increase the chance of receiving peers a node doesn't already know about for increased efficiency and reduction in redundant data

[satsen]

Peer entries are just a couple of bytes, is there really any reason to limit how many are received?

[ross-weir]

Peer entries are just a couple of bytes, is there really any reason to limit how many are received?

Mode feature in peer specs are allowed to be up to 512 bytes alone

I still think it would be nice to have for light clients in particular