Add gRPC server & reflection (cosmos#6463)

* Add gRPC proxy

* Make GRPC disabled by default

* WIP on integration tests

* WIP on integration tests

* Start setting up in process tests

* Start setting up in process tests

* Make it compile

* Add start server to network util

* Add Println

* Use go routine

* Fix scopelint

* Move to proxy_test

* Add response type cache

* Remove proxy

* Tweaks

* Use channel to handle error

* Use error chan

* Update server/start.go

Co-authored-by: Federico Kunze <[email protected]>

* Use %w

* Add sdk.Context

* Add comments

* Fix lint

* Add header and tests

* Address comments

* Factorize some code

* Fix lint

* Add height and prove in req metadata

* Add reflection test

* Fix lint

* Put grpc test in server/grpc

* Update baseapp/grpcserver.go

* Update baseapp/grpcserver.go

* Remove proof header

Co-authored-by: Amaury Martiny <[email protected]>
Co-authored-by: Federico Kunze <[email protected]>
Co-authored-by: Alexander Bezobchuk <[email protected]>
Co-authored-by: SaReN <[email protected]>

simd/cmd/root.go

@@ -21,6 +21,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/keys"
 	"github.com/cosmos/cosmos-sdk/client/rpc"
 	"github.com/cosmos/cosmos-sdk/server"
+	servertypes "github.com/cosmos/cosmos-sdk/server/types"
 	"github.com/cosmos/cosmos-sdk/simapp"
 	"github.com/cosmos/cosmos-sdk/store"
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -148,7 +149,7 @@ func txCommand() *cobra.Command {
 	return cmd
 }
 
-func newApp(logger log.Logger, db dbm.DB, traceStore io.Writer, appOpts server.AppOptions) server.Application {
+func newApp(logger log.Logger, db dbm.DB, traceStore io.Writer, appOpts servertypes.AppOptions) servertypes.Application {
 	var cache sdk.MultiStorePersistentCache
 
 	if cast.ToBool(appOpts.Get(server.FlagInterBlockCache)) {