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

rpc/swagger/swagger.yaml

@@ -1168,8 +1168,6 @@ definitions:
       - "chain_id"
       - "height"
       - "time"
-      - "num_txs"
-      - "total_txs"
       - "last_block_id"
       - "last_commit_hash"
       - "data_hash"
@@ -1202,12 +1200,6 @@ definitions:
       time:
         type: string
         x-example: "2019-04-22T17:01:51.701356223Z"
-      num_txs:
-        type: string
-        x-example: "2"
-      total_txs:
-        type: string
-        x-example: "3"
       last_block_id:
         $ref: "#/definitions/BlockID"
       last_commit_hash:
@@ -1596,8 +1588,6 @@ definitions:
                   - "chain_id"
                   - "height"
                   - "time"
-                  - "num_txs"
-                  - "total_txs"
                   - "last_block_id"
                   - "last_commit_hash"
                   - "data_hash"
@@ -1630,12 +1620,6 @@ definitions:
                   time:
                     type: "string"
                     example: "2019-04-22T17:01:51.701356223Z"
-                  num_txs:
-                    type: "string"
-                    example: "2"
-                  total_txs:
-                    type: "string"
-                    example: "3"
                   last_block_id:
                     required:
                       - "hash"