Add wallet and API info on ergoConnector

[capt-nemo429]

Add a method called ergoConnector.nautilus.getInfo(), it should return:

{
  name: string, // verbose wallet name
  icon: string, // base64 wallet icon
  apiVersion: string, // dApp Connector API version
  walletVerson: string, // wallet version
  network: "mainnet" | "testnet"
}