[12.x] Adds Macroable trait to Illuminate/Support/Benchmark

[1tim22]

Greetings All:

This simple PR updates Benchmark with the Macroable trait to allow arbitrary macro registration. For example, a macro log could be registered to log benchmark data:

use Closure;
use Illuminate\Support\Benchmark;
use Illuminate\Support\Facades\Log;

Benchmark::macro('log', fn (Closure $callback) =>
    Log::debug(Benchmark::measure($callback))
);

Which could then be invoked:

Benchmark::log(fn () => sleep(1));

// [2025-09-18 07:21:56] local.DEBUG: 1000.447882

Customization of how benchmark data is reported would now be possible.

Thanks in advance!

--
Andrew