[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