feat: Implement net_peerCount method

[Boreas09]

Returns the number of peers currently connected to the client.

Parameters :

None

Returns :

peer count: A hexadecimal of the number of connected peers.

Request :

curl https://mainnet.infura.io/v3/YOUR-API-KEY \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"net_peerCount","params": [],"id":1}'

Response :

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x64"
}

DO NOT FORGET TO UPDATE methodsStatus.md (set this method as finished)

/rosettanet/docs/methodsStatus.md

methodsStatus.md