gRPC-gateway routes as alternative to legacy tendermint REST endpoints (

cosmos#7965)

* WIP

* WIP setup

* WIP setup testsuite

* add node_info

* add GetLatestBlock,GetBlockByHeight grpc endpoints

* add GetValidatorSetByHeight, GetLatestValidatorSet

* fix lint

* fix tests

* proto format

* Update Makefile

* review changes

* Makefile format

* handle nil pagination

* rename query.go to service.go

* format Makefile

* format Makefile

* review changes

* review changes

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

app.go

@@ -18,6 +18,7 @@ import (
 
 	"github.com/cosmos/cosmos-sdk/baseapp"
 	"github.com/cosmos/cosmos-sdk/client"
+	"github.com/cosmos/cosmos-sdk/client/grpc/tmservice"
 	"github.com/cosmos/cosmos-sdk/client/rpc"
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/codec/types"
@@ -560,6 +561,8 @@ func (app *SimApp) RegisterAPIRoutes(apiSvr *api.Server, apiConfig config.APICon
 	authrest.RegisterTxRoutes(clientCtx, apiSvr.Router)
 	// Register new tx routes from grpc-gateway.
 	authtx.RegisterGRPCGatewayRoutes(clientCtx, apiSvr.GRPCRouter)
+	// Register new tendermint queries routes from grpc-gateway.
+	tmservice.RegisterGRPCGatewayRoutes(clientCtx, apiSvr.GRPCRouter)
 
 	// Register legacy and grpc-gateway routes for all modules.
 	ModuleBasics.RegisterRESTRoutes(clientCtx, apiSvr.Router)
@@ -576,6 +579,11 @@ func (app *SimApp) RegisterTxService(clientCtx client.Context) {
 	authtx.RegisterTxService(app.BaseApp.GRPCQueryRouter(), clientCtx, app.BaseApp.Simulate, app.interfaceRegistry)
 }
 
+// RegisterTendermintService implements the Application.RegisterTendermintService method.
+func (app *SimApp) RegisterTendermintService(clientCtx client.Context) {
+	tmservice.RegisterTendermintService(app.BaseApp.GRPCQueryRouter(), clientCtx, app.interfaceRegistry)
+}
+
 // RegisterSwaggerAPI registers swagger route with API Server
 func RegisterSwaggerAPI(ctx client.Context, rtr *mux.Router) {
 	statikFS, err := fs.New()