gRPC interface reflection. (cosmos#6722)

* WIP on gRPC interface reflection.

* Update docs in proto

* Add tests

* Add test

* Add route inside router

* Address nits

* ListInterfaces -> ListAllInterfaces

* Fix proto lint

* Remove stray println

* Update proto/cosmos/base/reflection/v1beta1/reflection.proto

Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>

* Update codec/types/interface_registry.go

Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>

* Update codec/types/interface_registry.go

Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>

* Add godoc

Co-authored-by: Amaury Martiny <amaury.martiny@protonmail.com>
Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>

app.go

@@ -181,7 +181,7 @@ func NewSimApp(
 	bApp := baseapp.NewBaseApp(appName, logger, db, encodingConfig.TxConfig.TxDecoder(), baseAppOptions...)
 	bApp.SetCommitMultiStoreTracer(traceStore)
 	bApp.SetAppVersion(version.Version)
-	bApp.GRPCQueryRouter().SetAnyUnpacker(interfaceRegistry)
+	bApp.GRPCQueryRouter().SetInterfaceRegistry(interfaceRegistry)
 
 	keys := sdk.NewKVStoreKeys(
 		authtypes.StoreKey, banktypes.StoreKey, stakingtypes.StoreKey,