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/WP_CLI/Action/Get_Command.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace Action_Scheduler\WP_CLI\Action;
+
+/**
+ * WP-CLI command: action-scheduler action get
+ */
+class Get_Command extends \ActionScheduler_WPCLI_Command {
+
+	/**
+	 * Execute command.
+	 *
+	 * @return void
+	 */
+	public function execute() {
+		$action_id = $this->args[0];
+		$store     = \ActionScheduler::store();
+		$logger    = \ActionScheduler::logger();
+		$action    = $store->fetch_action( $action_id );
+
+		if ( is_a( $action, ActionScheduler_NullAction::class ) ) {
+			/* translators: %d is action ID. */
+			\WP_CLI::error( sprintf( esc_html__( 'Unable to retrieve action %d.', 'action-scheduler' ), $action_id ) );
+		}
+
+		$only_logs   = ! empty( $this->assoc_args['field'] ) && 'log_entries' === $this->assoc_args['field'];
+		$only_logs   = $only_logs || ( ! empty( $this->assoc_args['fields'] ) && 'log_entries' === $this->assoc_args['fields'] );
+		$log_entries = array();
+
+		foreach ( $logger->get_logs( $action_id ) as $log_entry ) {
+			$log_entries[] = array(
+				'date'    => $log_entry->get_date()->format( static::DATE_FORMAT ),
+				'message' => $log_entry->get_message(),
+			);
+		}
+
+		if ( $only_logs ) {
+			$args = array(
+				'format' => \WP_CLI\Utils\get_flag_value( $this->assoc_args, 'format', 'table' ),
+			);
+
+			$formatter = new \WP_CLI\Formatter( $args, array( 'date', 'message' ) );
+			$formatter->display_items( $log_entries );
+
+			return;
+		}
+
+		try {
+			$status = $store->get_status( $action_id );
+		} catch ( \Exception $e ) {
+			\WP_CLI::error( $e->getMessage() );
+		}
+
+		$action_arr = array(
+			'id'             => $this->args[0],
+			'hook'           => $action->get_hook(),
+			'status'         => $status,
+			'args'           => $action->get_args(),
+			'group'          => $action->get_group(),
+			'recurring'      => $action->get_schedule()->is_recurring() ? 'yes' : 'no',
+			'scheduled_date' => $this->get_schedule_display_string( $action->get_schedule() ),
+			'log_entries'    => $log_entries,
+		);
+
+		$fields = array_keys( $action_arr );
+
+		if ( ! empty( $this->assoc_args['fields'] ) ) {
+			$fields = explode( ',', $this->assoc_args['fields'] );
+		}
+
+		$formatter = new \WP_CLI\Formatter( $this->assoc_args, $fields );
+		$formatter->display_item( $action_arr );
+	}
+
+}