chore(06-02): download and include Action Scheduler library

- Downloaded Action Scheduler 3.9.3 from GitHub
- Placed in vendor/action-scheduler/ directory
- Included in main plugin file before other code for proper initialization
- Library will auto-initialize itself when required

vendor/action-scheduler/classes/migration/LogMigrator.php

@@ -0,0 +1,58 @@
+<?php
+
+
+namespace Action_Scheduler\Migration;
+
+use ActionScheduler_Logger;
+
+/**
+ * Class LogMigrator
+ *
+ * @package Action_Scheduler\Migration
+ *
+ * @since 3.0.0
+ *
+ * @codeCoverageIgnore
+ */
+class LogMigrator {
+	/**
+	 * Source logger instance.
+	 *
+	 * @var ActionScheduler_Logger
+	 */
+	private $source;
+
+	/**
+	 * Destination logger instance.
+	 *
+	 * @var ActionScheduler_Logger
+	 */
+	private $destination;
+
+	/**
+	 * ActionMigrator constructor.
+	 *
+	 * @param ActionScheduler_Logger $source_logger Source logger object.
+	 * @param ActionScheduler_Logger $destination_logger Destination logger object.
+	 */
+	public function __construct( ActionScheduler_Logger $source_logger, ActionScheduler_Logger $destination_logger ) {
+		$this->source      = $source_logger;
+		$this->destination = $destination_logger;
+	}
+
+	/**
+	 * Migrate an action log.
+	 *
+	 * @param int $source_action_id Source logger object.
+	 * @param int $destination_action_id Destination logger object.
+	 */
+	public function migrate( $source_action_id, $destination_action_id ) {
+		$logs = $this->source->get_logs( $source_action_id );
+
+		foreach ( $logs as $log ) {
+			if ( absint( $log->get_action_id() ) === absint( $source_action_id ) ) {
+				$this->destination->log( $destination_action_id, $log->get_message(), $log->get_date() );
+			}
+		}
+	}
+}