cmd/protoc-gen-go-grpc: default use_generic_streams_experimental to true (#7387)

Author: arvindbr8

cmd/protoc-gen-go-grpc/main.go

@@ -57,7 +57,7 @@ func main() {
 
 	var flags flag.FlagSet
 	requireUnimplemented = flags.Bool("require_unimplemented_servers", true, "set to false to match legacy behavior")
-	useGenericStreams = flags.Bool("use_generic_streams_experimental", false, "set to true to use generic types for streaming client and server objects; this flag is EXPERIMENTAL and may be changed or removed in a future release")
+	useGenericStreams = flags.Bool("use_generic_streams_experimental", true, "set to true to use generic types for streaming client and server objects; this flag is EXPERIMENTAL and may be changed or removed in a future release")
 
 	protogen.Options{
 		ParamFunc: flags.Set,