refactor(cmd): use factories instead of global cobra command structs (#238)

This enables us to create new commands for e2e tests.

internal/log/log.go

@@ -0,0 +1,23 @@
+package log
+
+import (
+	"io"
+	"log/slog"
+	"os"
+	"time"
+
+	"github.com/lmittmann/tint"
+)
+
+func GetLogger(w io.Writer) *slog.Logger {
+	return slog.New(
+		tint.NewHandler(w, &tint.Options{
+			Level:      slog.LevelDebug,
+			TimeFormat: time.RFC3339,
+		}),
+	)
+}
+
+func init() {
+	slog.SetDefault(GetLogger(os.Stderr))
+}