TUN-7700: Implement feature selector to determine if connections will prefer post quantum cryptography

cmd/cloudflared/tunnel/config_test.go

@@ -4,10 +4,12 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/require"
+
+	"github.com/cloudflare/cloudflared/features"
 )
 
 func TestDedup(t *testing.T) {
 	expected := []string{"a", "b"}
-	actual := dedup([]string{"a", "b", "a"})
+	actual := features.Dedup([]string{"a", "b", "a"})
 	require.ElementsMatch(t, expected, actual)
 }