[autodetect] Move autodetect to pkg (#2330)

## Summary

closes DEV-153

Stacked on #2325

## How was it tested?

Author: mikeland73

internal/boxcli/init.go

@@ -7,8 +7,8 @@ import (
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 
-	"go.jetpack.io/devbox/internal/autodetect"
 	"go.jetpack.io/devbox/internal/devbox"
+	"go.jetpack.io/devbox/pkg/autodetect"
 )
 
 type initFlags struct {

internal/autodetect/autodetect.go renamed to pkg/autodetect/autodetect.go

@@ -5,9 +5,9 @@ import (
 	"fmt"
 	"io"
 
-	"go.jetpack.io/devbox/internal/autodetect/detector"
 	"go.jetpack.io/devbox/internal/devbox"
 	"go.jetpack.io/devbox/internal/devbox/devopt"
+	"go.jetpack.io/devbox/pkg/autodetect/detector"
 )
 
 func PopulateConfig(ctx context.Context, path string, stderr io.Writer) error {