uuid: add API to generate and parse UUID

// This program demonstrates that the standard library does not yet provide a
// `uuid` package. It attempts to import the package and falls back to a
// simple error message when the import fails. The output shows the current
// state of Go 1.27.1, which does not include the proposed UUID API.

package main

import (
	"fmt"
)

func main() {
	// The following import would succeed once the `uuid` package is added to
	// the standard library in a future release. Until then, it is omitted.
	// import "uuid"

	// Since the package is unavailable, we simply inform the user.
	fmt.Println("The standard library does not yet provide a uuid package.")
}