Use system tables for sharding

src/Plugin/Sharding/CreateHandler.php

@@ -150,7 +150,7 @@ protected static function getShardingFn(): Closure {
 			$timeout = $payload->getShardingTimeout();
 			while (true) {
 				// TODO: think about the way to refactor it and remove duplication
-				$q = "select value[0] as value from _sharding_state where `key` = 'table:{$payload->table}'";
+				$q = "select value[0] as value from system.sharding_state where `key` = 'table:{$payload->table}'";
 				$resp = $client->sendRequest($q);
 				$result = $resp->getResult();
 				/** @var array{0:array{data?:array{0:array{value:string}}}} $result */

src/Plugin/Sharding/DropHandler.php

@@ -120,7 +120,7 @@ protected function validate(): ?Task {
 	 */
 	protected function getTableState(string $table): array {
 		// TODO: think about the way to refactor it and remove duplication
-		$q = "select value[0] as value from _sharding_state where `key` = 'table:{$table}'";
+		$q = "select value[0] as value from system.sharding_state where `key` = 'table:{$table}'";
 		$resp = $this->manticoreClient->sendRequest($q);
 
 		/** @var array{0:array{data?:array{0:array{value:string}}}} $result */

src/Plugin/Sharding/Queue.php

@@ -35,7 +35,7 @@ public function __construct(
 		protected Cluster $cluster,
 		protected Client $client
 	) {
-		$this->table = '_sharding_queue';
+		$this->table = 'system.sharding_queue';
 	}
 
 	/**

src/Plugin/Sharding/State.php

@@ -25,7 +25,7 @@ final class State {
 	public function __construct(
 		protected Client $client
 	) {
-		$this->table = '_sharding_state';
+		$this->table = 'system.sharding_state';
 	}
 
 	/**

src/Plugin/Sharding/Table.php

@@ -27,7 +27,7 @@ public function __construct(
 		protected readonly string $structure,
 		protected readonly string $extra
 	) {
-		$this->table = '_sharding_table';
+		$this->table = 'system.sharding_table';
 	}
 
 	/**