ZERO-162 Created repo and updated other files with right information

Api/CmsBlockRepositoryInterface.php

+<?php
+declare(strict_types=1);
+namespace Firegento\ContentProvisioning\Api;
+
+interface CmsBlockRepositoryInterface
+{
+    /**
+     * Get CMS Block data by its identifier.
+     *
+     * @param string $identifier
+     * @return array
+     */
+    public function getByIdentifier(string $identifier): array;
+}
\ No newline at end of file

Model/Query/GetCmsBlockByIdentifier.php

+<?php
+declare(strict_types=1);
+namespace Firegento\ContentProvisioning\Model\Query;
+
+use Magento\Framework\App\State;
+use Firegento\ContentProvisioning\Api\CmsBlockRepositoryInterface;
+
+class GetCmsBlockByIdentifier
+{
+    private $cmsBlockRepository;
+
+    public function __construct(
+        CmsBlockRepositoryInterface $cmsBlockRepository
+    ) {
+        $this->cmsBlockRepository = $cmsBlockRepository;
+    }
+
+    protected function execute(string $key)
+    {
+        $blockData = $this->cmsBlockRepository->getByIdentifier($key);
+
+        if (empty($blockData)) {
+            throw new NotFoundException(__('Block with key %1 not found.', $key));
+        }
+
+        return $blockData;
+    }
+}
\ No newline at end of file

Model/Repository/CmsBlockRepository.php

+<?php
+declare(strict_types=1);
+namespace Firegento\ContentProvisioning\Model\Repository;
+
+use Firegento\ContentProvisioning\Api\CmsBlockRepositoryInterface;
+use Magento\Framework\App\ResourceConnection;
+
+class CmsBlockRepository implements CmsBlockRepositoryInterface
+{
+    /**
+     * @var ResourceConnection
+     */
+    private $resource;
+
+    /**
+     * CmsBlockRepository constructor.
+     *
+     * @param ResourceConnection $resource
+     */
+    public function __construct(
+        ResourceConnection $resource
+    ) {
+        $this->resource = $resource;
+    }
+
+    /**
+     * Get CMS Block data by its identifier.
+     *
+     * @param string $identifier
+     * @return array
+     */
+    public function getByIdentifier(string $identifier): array
+    {
+        $connection = $this->resource->getConnection();
+        $tableName = $this->resource->getTableName('cms_block'); // Get table with prefix
+
+        $sql = "SELECT * FROM $tableName WHERE identifier = :identifier";
+        $bind = ['identifier' => $identifier];
+
+        $result = $connection->fetchRow($sql, $bind); // Fetch a single row
+        return $result ? $result : [];
+    }
+}
\ No newline at end of file

etc/di.xml

@@ -148,4 +148,10 @@
             </argument>
         </arguments>
     </type>
+    <type name="Firegento\ContentProvisioning\Api\CmsBlockRepositoryInterface">
+        <arguments>
+            <argument name="resource" xsi:type="object">Magento\Framework\App\ResourceConnection</argument>
+        </arguments>
+    </type>
+    <preference for="Firegento\ContentProvisioning\Api\CmsBlockRepositoryInterface" type="Firegento\ContentProvisioning\Model\Repository\CmsBlockRepository" />
 </config>