refactor: parameterize submit delay

pkg/provider/provider.go

@@ -1,6 +1,12 @@
 package provider
 
+import "time"
+
 type ProviderIface interface {
-	Login(user, pass string) error
-	SwitchWIFI() error
+	Login(string, string) error
+	SwitchWIFI(SwitchConfig) error
+}
+
+type SwitchConfig struct {
+	SubmitDelay time.Duration
 }