cmd/devp2p: add devp2p debug tool (#19657)
- p2p/discover: export Ping and RequestENR
These two are useful for checking the status of a node.
- cmd/devp2p: add devp2p debug tool
This is a new tool for debugging p2p issues. It supports a few
basic tasks for now, but many more things can and will be added
in the near future.
devp2p enrdump -- prints ENRs readably devp2p discv4 ping -- checks if a node is up devp2p discv4 requestenr -- gets a node's record devp2p discv4 resolve -- finds a node through the DHT