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

server/start.go

@@ -258,10 +258,10 @@ func startInProcess(ctx *Context, clientCtx client.Context, appCreator types.App
 	// service if API or gRPC is enabled, and avoid doing so in the general
 	// case, because it spawns a new local tendermint RPC client.
 	if config.API.Enable || config.GRPC.Enable {
-		clientCtx = clientCtx.
-			WithClient(local.New(tmNode))
+		clientCtx = clientCtx.WithClient(local.New(tmNode))
 
 		app.RegisterTxService(clientCtx)
+		app.RegisterTendermintService(clientCtx)
 	}
 
 	var apiSrv *api.Server

server/types/app.go

@@ -43,6 +43,9 @@ type (
 		// RegisterTxService registers the gRPC Query service for tx (such as tx
 		// simulation, fetching txs by hash...).
 		RegisterTxService(clientCtx client.Context)
+
+		// RegisterTendermintService registers the gRPC Query service for tendermint queries.
+		RegisterTendermintService(clientCtx client.Context)
 	}
 
 	// AppCreator is a function that allows us to lazily initialize an