feat: enable querying state through grpc (#3423)

Closes: #3422

We seemed to have forgotten to add the query function which means
`ABCIQuery` wasn't working even although the grpc endpoint was exposed

also related to: #3421

Co-authored-by: Ismail Khoffi <Ismail.Khoffi@gmail.com>
(cherry picked from commit 99bbedf)

app/app.go

@@ -691,7 +691,7 @@ func (app *App) RegisterTxService(clientCtx client.Context) {
 
 // RegisterTendermintService implements the Application.RegisterTendermintService method.
 func (app *App) RegisterTendermintService(clientCtx client.Context) {
-	tmservice.RegisterTendermintService(clientCtx, app.BaseApp.GRPCQueryRouter(), app.interfaceRegistry, nil)
+	tmservice.RegisterTendermintService(clientCtx, app.BaseApp.GRPCQueryRouter(), app.interfaceRegistry, app.Query)
 }
 
 func (app *App) RegisterNodeService(clientCtx client.Context) {