[cmpctblock]In order to achieve quicker block relay, we need to send newValidPoWBlock through cmpctblock msg after block accepted

[whunmr]

describe
currently block relay is throught inv/headers, getdata cycle

Describe the solution you'd like
send newValidPoWBlock through cmpctblock message

Additional context

refer to logic in ABC's code:

void PeerLogicValidation::NewPoWValidBlock(
    const CBlockIndex *pindex, const std::shared_ptr<const CBlock> &pblock) {

    connman->ForEachNode([this, &pcmpctblock, pindex, &msgMaker,
                          &hashBlock](CNode *pnode) {

        // If the peer has, or we announced to them the previous block already,
        // but we don't think they have this one, go ahead and announce it.
        if (state.fPreferHeaderAndIDs && !PeerHasHeader(&state, pindex) &&
            PeerHasHeader(&state, pindex->pprev)) {

            LogPrint(BCLog::NET, "%s sending header-and-ids %s to peer=%d\n",
                     "PeerLogicValidation::NewPoWValidBlock",
                     hashBlock.ToString(), pnode->GetId());
            connman->PushMessage(
                pnode, msgMaker.Make(NetMsgType::CMPCTBLOCK, *pcmpctblock));
            state.pindexBestHeaderSent = pindex;
        }
    });
}

    else if (strCommand == NetMsgType::GETHEADERS) {
        ...
        // pindex can be nullptr either if we sent chainActive.Tip() OR
        // if our peer has chainActive.Tip() (and thus we are sending an empty
        // headers message). In both cases it's safe to update
        // pindexBestHeaderSent to be our tip.
        //
        // It is important that we simply reset the BestHeaderSent value here,
        // and not max(BestHeaderSent, newHeaderSent). We might have announced
        // the currently-being-connected tip using a compact block, which
        // resulted in the peer sending a headers request, which we respond to
        // without the new block. By resetting the BestHeaderSent, we ensure we
        // will re-announce the new block via headers (or compact blocks again)
        // in the SendMessages logic.
        nodestate->pindexBestHeaderSent = pindex ? pindex : chainActive.Tip();
        connman->PushMessage(pfrom,
                             msgMaker.Make(NetMsgType::HEADERS, vHeaders));
    }