[BUG] 建议优化Class Hyperf\Metric\Adapter\Prometheus\Redis中的collectSamples方法的性能

在hyperf\metric\src\Adapter\Prometheus\Redis.php中，这个protected function collectSamples(string $metricType): array方法的实现效率太低，对于有海量数据的指标，会导致长时间锁定key，从而导致想要对相关key进行操作时，超时失败，我的修改如下，经过测试性能提升非常显著：
/**
* @throws RedisException
/
protected function collectSamples(string $metricType): array
{
$keys = $this->redis->sMembers($this->getMetricGatherKey($metricType));
sort($keys);
foreach ($keys as $key) {
$key = str_replace($this->redis->_prefix(''), '', $key);
$metastr = $this->redis->hget($key, '__meta');
if(!$metastr) continue;
$sample = array_merge(Json::decode($metastr), ['samples' => []]);
$cursor = NULL;
do {
$raw = $this->redis->hscan($key, $cursor, '', 1000);
unset($raw['__meta']);
foreach ($raw as $k => $value) {
if (count($sample['labelNames'] ?? []) !== count(json_decode($k, true))) {
continue;
}

$sample['samples'][] = [
'name' => $sample['name'],
'labelNames' => [],
'labelValues' => Json::decode($k),
'value' => $value,
];
}
} while ($cursor != 0);

usort($sample['samples'], fn ($a, $b) => strcmp(implode('', $a['labelValues']), implode('', $b['labelValues'])));
$samples[] = $sample;
}

return $samples ?? [];
}

修改的重点是将hgetall改为hscan方法

Start in hyperf/metric/src/Adapter/Prometheus/Redis.php at the protected collectSamples(string $metricType): array method. Compare the current hgetall-based collection with the proposed hscan approach, including metadata handling, cursor iteration, sorting, and label filtering. Done means large metrics no longer hold the Redis key for so long while the collected samples remain correct.

Written by the indexing model from the issue text.