abci: remove TotalTxs and NumTxs from Header (#3783)

* Removal of TotalTx & NumTx

- Removed totalTx and numTx

closes #2521

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* abci proto changes

* proto number fix

* txfilter_test fix

* comments on PR

* further changes

* bring back metrics

* fix indexer

* fix TestBlockMaxDataBytes and TestBlockMaxDataBytesUnknownEvidence

* indexer service back to header

* statistics.go fix

* fix ci

* listen for blocks, not headers

to be able to record txs throughput

* fix TestNetworkNewBlock

* fix tests

* fix tests in types package

* fixes after Anton's review

* fix tests

* bring back `consensus_total_txs` metric

I mistakenly thought it was removed.

* improve changelog

* remove LastBlockTotalTx from state

* docs: remove getNumTxs from BeginBlock Java example

lite/helpers.go

@@ -112,11 +112,9 @@ func genHeader(chainID string, height int64, txs types.Txs,
 	valset, nextValset *types.ValidatorSet, appHash, consHash, resHash []byte) *types.Header {
 
 	return &types.Header{
-		ChainID:  chainID,
-		Height:   height,
-		Time:     tmtime.Now(),
-		NumTxs:   int64(len(txs)),
-		TotalTxs: int64(len(txs)),
+		ChainID: chainID,
+		Height:  height,
+		Time:    tmtime.Now(),
 		// LastBlockID
 		// LastCommitHash
 		ValidatorsHash:     valset.Hash(),