fix(sort): added ability to add score sorting to sort collection

- Changed properties in Sort class from private to public
- Enhanced handling of '_score' field in SortCollection and Options classes

Author: Spamercz

src/Options.php

@@ -84,6 +84,11 @@ public function toArray(): array
 		}
 
 		foreach ($this->sort as $item) {
+			if ($item->field === '_score') {
+				$array['sort'][] = $item->field;
+				continue;
+			}
+
 			$array['sort'][] = $item->toArray();
 		}
 

src/Options/Sort.php

@@ -17,9 +17,9 @@ class Sort implements \Spameri\ElasticQuery\Entity\EntityInterface
 	public const MISSING_FIRST = '_first';
 
 	public function __construct(
-		private string $field,
-		private string $type = self::DESC,
-		private string $missing = self::MISSING_LAST,
+		public string $field,
+		public string $type = self::DESC,
+		public string $missing = self::MISSING_LAST,
 	)
 	{
 		if ( ! \in_array($type, [self::ASC, self::DESC], true)) {

src/Options/SortCollection.php

@@ -12,7 +12,13 @@ public function toArray(): array
 	{
 		$array = [];
 
+		/** @var \Spameri\ElasticQuery\Options\Sort $sort */
 		foreach ($this->collection as $sort) {
+			if ($sort->field === '_score') {
+				$array[] = $sort->field;
+				continue;
+			}
+
 			$array[] = $sort->toArray();
 		}