Implement WaitForExec using new Client library. Add BaseWait to avoid some code duplication. Adjust Postgres test

src/Wait/WaitForLog.php

@@ -5,23 +5,20 @@ declare(strict_types=1);
 namespace Testcontainers\Wait;
 
 use Docker\API\Runtime\Client\Client;
-use Docker\Docker;
 use Testcontainers\Exception\ContainerWaitingTimeoutException;
 
 /**
  * Uses $timout and $pollInterval in milliseconds to set the parameters for waiting.
  */
-class WaitForLog implements WaitInterface
+class WaitForLog extends BaseWait
 {
-    protected Docker $dockerClient;
-
     public function __construct(
         protected string $message,
         protected bool $enableRegex = false,
-        protected int $timeout = 10000,
-        protected int $pollInterval = 500
+        int $timeout = 10000,
+        int $pollInterval = 500
     ) {
-        $this->dockerClient = Docker::create();
+        parent::__construct($timeout, $pollInterval);
     }
 
     public function wait(string $id): void