add clear method to ChangeSet, IdentityMap, and EntityManager classes

Author: Spamercz

src/EntityManager.php

@@ -233,4 +233,11 @@ public function remove(\Spameri\Elastic\Entity\AbstractElasticEntity $entity): b
 		return true;
 	}
 
+
+	public function clear(): void
+	{
+		$this->identityMap->clear();
+		$this->changeSet->clear();
+	}
+
 }

src/Model/ChangeSet.php

@@ -26,4 +26,10 @@ public function isExisting(
 		return isset($this->created[$entity::class][\spl_object_hash($entity)]);
 	}
 
+
+	public function clear(): void
+	{
+		$this->created = [];
+	}
+
 }

src/Model/IdentityMap.php

@@ -121,4 +121,13 @@ private function getSerializedString(\Spameri\Elastic\Entity\AbstractElasticEnti
 		return \md5(\serialize($serializedArray));
 	}
 
+
+	public function clear(): void
+	{
+		$this->identityMap = [];
+		$this->persisted = [];
+		$this->creatingEntityList = [];
+		$this->uninitializedEntityList = [];
+	}
+
 }