add step list for server creation

local/utl/command/callbacks.go

@@ -0,0 +1,19 @@
+package command
+
+import "github.com/google/uuid"
+
+type OutputCallback func(serverID uuid.UUID, output string, isError bool)
+
+type CommandCallback func(serverID uuid.UUID, command string, args []string, completed bool, success bool, error string)
+
+type CallbackConfig struct {
+	OnOutput  OutputCallback
+	OnCommand CommandCallback
+}
+
+func DefaultCallbackConfig() *CallbackConfig {
+	return &CallbackConfig{
+		OnOutput:  func(uuid.UUID, string, bool) {},
+		OnCommand: func(uuid.UUID, string, []string, bool, bool, string) {},
+	}
+}