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.
vRecv >> locator >> hashStop;
        if (locator.vHave.size() > MAX_LOCATOR_SZ) {
            LogPrint(BCLog::NET, "getheaders locator size %lld > %d, disconnect peer=%d\n", locator.vHave.size(), MAX_LOCATOR_SZ, pfrom.GetId());
            pfrom.fDisconnect = true;
            return;
        }
        LOCK(cs_main);
        if (::ChainstateActive().IsInitialBlockDownload() && !pfrom.HasPermission(PF_DOWNLOAD)) {
            LogPrint(BCLog::NET, "Ignoring getheaders from peer=%d because node is in initial block download\n", pfrom.GetId());
            return;
        }
        CNodeState *nodestate = State(pfrom.GetId());
        const CBlockIndex* pindex = nullptr;
        if (locator.IsNull())
        {
            
            pindex = LookupBlockIndex(hashStop);
            if (!pindex) {
                return;
            }
            if (!BlockRequestAllowed(pindex, m_chainparams.GetConsensus())) {
                LogPrint(BCLog::NET, "%s: ignoring request from peer=%i for old block header that isn't in the main chain\n", __func__, pfrom.GetId());
                return;
            }
        }
        else
        {
            
            pindex = FindForkInGlobalIndex(::ChainActive(), locator);
            if (pindex)