add default provider

providers/single_flight/flight.go

@@ -6,6 +6,13 @@ import (
 	"golang.org/x/sync/singleflight"
 )
 
+func DefaultProvider() container.ProviderContainer {
+	return container.ProviderContainer{
+		Provider: Provide,
+		Options:  []opt.Option{},
+	}
+}
+
 func Provide(opts ...opt.Option) error {
 	o := opt.New(opts...)
 	return container.Container.Provide(func() (*singleflight.Group, error) {