gRPC gateway init (cosmos#7019)

* WIP: grpc server setup

* add register grpc routes

* updated go mod

* updated grpc for all modules

* added pb file for grpc gateway

* udpated gw file

* added a test for grpc route

* fixed conflicts

* added grpc server

* grpc tests added

* cleanup

* Fix gateway forward issue

* Add godoc

* updated tests

* fix lint

* fix tests

* fix tests

* fix tests

* fixed test

* Add grpc headers

* Fix error handling

* Fix tests - hacky

* Fix lint

* remove debug logs

* Fix review comments

* move grpc tests into a separate file

* Fix protobuf version

* Update x/capability/module.go

* Fix godoc

* Fix review suggestions

* Fix codec

* Add query params test for gateway request

* Fix gofmt

Co-authored-by: anilCSE <anil@vitwit.com>
Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>

app.go

@@ -512,6 +512,7 @@ func (app *SimApp) RegisterAPIRoutes(apiSvr *api.Server) {
 	rpc.RegisterRoutes(clientCtx, apiSvr.Router)
 	authrest.RegisterTxRoutes(clientCtx, apiSvr.Router)
 	ModuleBasics.RegisterRESTRoutes(clientCtx, apiSvr.Router)
+	ModuleBasics.RegisterGRPCRoutes(apiSvr.ClientCtx, apiSvr.GRPCRouter)
 }
 
 // GetMaccPerms returns a copy of the module account permissions