For every peer expose through `getpeerinfo` RPC whether or not we selected them as HB peers, and whether or not they selected us as HB peers.

Suggestion by @gmaxwell.
{
    return RPCHelpMan{"addpeeraddress",
        "\nAdd the address of a potential peer to the address manager. This RPC is for testing only.\n",
        {
            {"address", RPCArg::Type::STR, RPCArg::Optional::NO, "The IP address of the peer"},
            {"port", RPCArg::Type::NUM, RPCArg::Optional::NO, "The port of the peer"},
        },
        RPCResult{
            RPCResult::Type::OBJ, "", "",
            {
                {RPCResult::Type::BOOL, "success", "whether the peer address was successfully added to the address manager"},
            },
        },
        RPCExamples{
            HelpExampleCli("addpeeraddress", "\"1.2.3.4\" 8333")