feat: port user commands from influxdb (#99)

internal/stdio/console.go

@@ -28,6 +28,11 @@ func (t *terminalStdio) Write(p []byte) (int, error) {
 	return t.Stdout.Write(p)
 }
 
+// WriteErr prints some bytes to stderr.
+func (t *terminalStdio) WriteErr(p []byte) (int, error) {
+	return t.Stderr.Write(p)
+}
+
 type bannerTemplateData struct {
 	Message string
 }

internal/stdio/stdio.go

@@ -4,6 +4,7 @@ import "io"
 
 type StdIO interface {
 	io.Writer
+	WriteErr(p []byte) (n int, err error)
 	Banner(message string) error
 	Error(message string) error
 	GetStringInput(prompt, defaultValue string) (string, error)