p2p/ws: connected peers REST endpoint and goal CLI

[urtho]

Status

Neither goal utility nor algod API have the ability to expose connected peers.

Expected

• algod should have a REST endpoints under /v2/status/peers that lists all connected peers , their network (WS or P2P) and direction
• goal should have a command that queries this endpoint and formats the output

[urtho]

REST endpoint implemented in d5c0053.
Needs

• wrapping into a goal command under goal node connected-peers
• proper tests

[urtho]

Testing P2P peers on current mainnet requires a catchup node and:

• 2 extra lines in config.json

"DNSBootstrapID": "<network>.algonode.network",
"EnableP2P": true

• fire up an algod compiled from peer-status branch

this will switch a mainnet participation node to P2P only mode.

a hybrid (P2P and WS) mode can be tested with EnableP2PHybridMode: true instead of EnableP2P: true